18604921957 has 8 divisors (see below), whose sum is σ = 19248019200. Its totient is φ = 17961927984.

The previous prime is 18604921931. The next prime is 18604921991. The reversal of 18604921957 is 75912940681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18604921957 is a prime.

It is a super-2 number, since 2×18604921957² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18604921997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 590128 + ... + 620854.

It is an arithmetic number, because the mean of its divisors is an integer number (2406002400).

Almost surely, 2^18604921957 is an apocalyptic number.

It is an amenable number.

18604921957 is a deficient number, since it is larger than the sum of its proper divisors (643097243).

18604921957 is a wasteful number, since it uses less digits than its factorization.

18604921957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51635.

The product of its (nonzero) digits is 1088640, while the sum is 52.

The spelling of 18604921957 in words is "eighteen billion, six hundred four million, nine hundred twenty-one thousand, nine hundred fifty-seven".