18561925317 has 16 divisors (see below), whose sum is σ = 26763627968. Its totient is φ = 11375320320.

The previous prime is 18561925271. The next prime is 18561925357. The reversal of 18561925317 is 71352916581.

It is not a de Polignac number, because 18561925317 - 2¹⁴ = 18561908933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18561925357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 978043 + ... + 996840.

It is an arithmetic number, because the mean of its divisors is an integer number (1672726748).

Almost surely, 2^18561925317 is an apocalyptic number.

It is an amenable number.

18561925317 is a deficient number, since it is larger than the sum of its proper divisors (8201702651).

18561925317 is a wasteful number, since it uses less digits than its factorization.

18561925317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1975140.

The product of its digits is 453600, while the sum is 48.

The spelling of 18561925317 in words is "eighteen billion, five hundred sixty-one million, nine hundred twenty-five thousand, three hundred seventeen".