18791265685 has 16 divisors (see below), whose sum is σ = 22598334720. Its totient is φ = 15000511680.

The previous prime is 18791265679. The next prime is 18791265781. The reversal of 18791265685 is 58656219781.

It is a happy number.

It is not a de Polignac number, because 18791265685 - 2¹³ = 18791257493 is a prime.

It is a super-2 number, since 2×18791265685² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5832375 + ... + 5835595.

It is an arithmetic number, because the mean of its divisors is an integer number (1412395920).

Almost surely, 2^18791265685 is an apocalyptic number.

It is an amenable number.

18791265685 is a deficient number, since it is larger than the sum of its proper divisors (3807069035).

18791265685 is a wasteful number, since it uses less digits than its factorization.

18791265685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5388.

The product of its digits is 7257600, while the sum is 58.

The spelling of 18791265685 in words is "eighteen billion, seven hundred ninety-one million, two hundred sixty-five thousand, six hundred eighty-five".