18432979297 has 4 divisors (see below), whose sum is σ = 18433250836. Its totient is φ = 18432707760.

The previous prime is 18432979277. The next prime is 18432979307. The reversal of 18432979297 is 79297923481.

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.

It can be written as a sum of positive squares in 2 ways, for example, as 11294588176 + 7138391121 = 106276^2 + 84489^2 .

It is a cyclic number.

It is not a de Polignac number, because 18432979297 - 2¹¹ = 18432977249 is a prime.

It is a super-2 number, since 2×18432979297² (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 (18432979277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67147 + ... + 203407.

It is an arithmetic number, because the mean of its divisors is an integer number (4608312709).

Almost surely, 2^18432979297 is an apocalyptic number.

It is an amenable number.

18432979297 is a deficient number, since it is larger than the sum of its proper divisors (271539).

18432979297 is a wasteful number, since it uses less digits than its factorization.

18432979297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271538.

The product of its digits is 13716864, while the sum is 61.

The spelling of 18432979297 in words is "eighteen billion, four hundred thirty-two million, nine hundred seventy-nine thousand, two hundred ninety-seven".