351621344655 has 80 divisors (see below), whose sum is σ = 730504963584. Its totient is φ = 158477135040.

The previous prime is 351621344647. The next prime is 351621344693. The reversal of 351621344655 is 556443126153.

It is a happy number.

351621344655 is a `hidden beast` number, since 3 + 51 + 6 + 2 + 134 + 465 + 5 = 666.

It is not a de Polignac number, because 351621344655 - 2³ = 351621344647 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 351621344655.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 672157 + ... + 1074726.

Almost surely, 2^351621344655 is an apocalyptic number.

351621344655 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

351621344655 is an abundant number, since it is smaller than the sum of its proper divisors (378883618929).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

351621344655 is a wasteful number, since it uses less digits than its factorization.

351621344655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746978 (or 1746969 counting only the distinct ones).

The product of its digits is 1296000, while the sum is 45.

The spelling of 351621344655 in words is "three hundred fifty-one billion, six hundred twenty-one million, three hundred forty-four thousand, six hundred fifty-five".