351212521618 has 24 divisors (see below), whose sum is σ = 629392992012. Its totient is φ = 146451551904.

The previous prime is 351212521613. The next prime is 351212521619. The reversal of 351212521618 is 816125212153.

It can be written as a sum of positive squares in 2 ways, for example, as 329564401929 + 21648119689 = 574077^2 + 147133^2 .

It is a Harshad number since it is a multiple of its sum of digits (37).

It is not an unprimeable number, because it can be changed into a prime (351212521613) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48426121 + ... + 48433372.

Almost surely, 2^351212521618 is an apocalyptic number.

351212521618 is a deficient number, since it is larger than the sum of its proper divisors (278180470394).

351212521618 is a wasteful number, since it uses less digits than its factorization.

351212521618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96859546 (or 96859539 counting only the distinct ones).

The product of its digits is 28800, while the sum is 37.

The spelling of 351212521618 in words is "three hundred fifty-one billion, two hundred twelve million, five hundred twenty-one thousand, six hundred eighteen".