351686337921 has 40 divisors (see below), whose sum is σ = 556987877600. Its totient is φ = 220519584000.

The previous prime is 351686337911. The next prime is 351686337941. The reversal of 351686337921 is 129733686153.

351686337921 is a `hidden beast` number, since 3 + 516 + 8 + 6 + 3 + 37 + 92 + 1 = 666.

It is not a de Polignac number, because 351686337921 - 2³⁵ = 317326599553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (351686337911) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 608080 + ... + 1035921.

It is an arithmetic number, because the mean of its divisors is an integer number (13924696940).

Almost surely, 2^351686337921 is an apocalyptic number.

It is an amenable number.

351686337921 is a deficient number, since it is larger than the sum of its proper divisors (205301539679).

351686337921 is a wasteful number, since it uses less digits than its factorization.

351686337921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1644171 (or 1644162 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 54.

The spelling of 351686337921 in words is "three hundred fifty-one billion, six hundred eighty-six million, three hundred thirty-seven thousand, nine hundred twenty-one".