18397395769 has 3 divisors (see below), whose sum is σ = 18397531407. Its totient is φ = 18397260132.

The previous prime is 18397395761. The next prime is 18397395773. The reversal of 18397395769 is 96759379381.

The square root of 18397395769 is 135637.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 96759379381 = 7 ⋅13822768483.

It can be written as a sum of positive squares in only one way, i.e., 17496675625 + 900720144 = 132275^2 + 30012^2 .

It is not a de Polignac number, because 18397395769 - 2³ = 18397395761 is a prime.

It is a super-2 number, since 2×18397395769² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18397395761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 67819 + ... + 203455.

It is an arithmetic number, because the mean of its divisors is an integer number (6132510469).

Almost surely, 2^18397395769 is an apocalyptic number.

18397395769 is the 135637-th square number.

18397395769 is the 67819-th centered octagonal number.

It is an amenable number.

18397395769 is a deficient number, since it is larger than the sum of its proper divisors (135638).

18397395769 is an frugal number, since it uses more digits than its factorization.

18397395769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271274 (or 135637 counting only the distinct ones).

The product of its digits is 77157360, while the sum is 67.

The spelling of 18397395769 in words is "eighteen billion, three hundred ninety-seven million, three hundred ninety-five thousand, seven hundred sixty-nine".