18397395770 has 48 divisors (see below), whose sum is σ = 36733330872. Its totient is φ = 6627179520.

The previous prime is 18397395761. The next prime is 18397395773. The reversal of 18397395770 is 7759379381.

It is a Cunningham number, because it is equal to 135637²+1.

It can be written as a sum of positive squares in 12 ways, for example, as 346667161 + 18050728609 = 18619^2 + 134353^2 .

It is a super-2 number, since 2×18397395770² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18397395773) 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 23 ways as a sum of consecutive naturals, for example, 63467 + ... + 202046.

Almost surely, 2^18397395770 is an apocalyptic number.

18397395770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18397395770 is a deficient number, since it is larger than the sum of its proper divisors (18335935102).

18397395770 is a wasteful number, since it uses less digits than its factorization.

18397395770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265587 (or 265574 counting only the distinct ones).

The product of its (nonzero) digits is 10001880, while the sum is 59.

The spelling of 18397395770 in words is "eighteen billion, three hundred ninety-seven million, three hundred ninety-five thousand, seven hundred seventy".