51185313612 has 30 divisors (see below), whose sum is σ = 133808521308. Its totient is φ = 17061771096.

The previous prime is 51185313611. The next prime is 51185313629. The reversal of 51185313612 is 21631358115.

It is a happy number.

51185313612 is a `hidden beast` number, since 5 + 1 + 1 + 8 + 5 + 31 + 3 + 612 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (51185313611) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 78989358 + ... + 78990005.

Almost surely, 2^51185313612 is an apocalyptic number.

It is an amenable number.

51185313612 is an abundant number, since it is smaller than the sum of its proper divisors (82623207696).

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

51185313612 is a wasteful number, since it uses less digits than its factorization.

51185313612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157979379 (or 157979368 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The spelling of 51185313612 in words is "fifty-one billion, one hundred eighty-five million, three hundred thirteen thousand, six hundred twelve".