51116506506 has 24 divisors (see below), whose sum is σ = 119271849060. Its totient is φ = 15728155776.

The previous prime is 51116506471. The next prime is 51116506523. The reversal of 51116506506 is 60560561115.

It can be written as a sum of positive squares in 2 ways, for example, as 36754641225 + 14361865281 = 191715^2 + 119841^2 .

It is a super-2 number, since 2×51116506506² (a number of 22 digits) contains 22 as substring.

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 11 ways as a sum of consecutive naturals, for example, 109223071 + ... + 109223538.

Almost surely, 2^51116506506 is an apocalyptic number.

51116506506 is an abundant number, since it is smaller than the sum of its proper divisors (68155342554).

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

51116506506 is a wasteful number, since it uses less digits than its factorization.

51116506506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218446630 (or 218446627 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 51116506506 in words is "fifty-one billion, one hundred sixteen million, five hundred six thousand, five hundred six".