51211105515 has 24 divisors (see below), whose sum is σ = 92625305760. Its totient is φ = 26125085184.

The previous prime is 51211105457. The next prime is 51211105537. The reversal of 51211105515 is 51550111215.

It is a happy number.

It is not a de Polignac number, because 51211105515 - 2⁸ = 51211105259 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 24738630 + ... + 24740699.

It is an arithmetic number, because the mean of its divisors is an integer number (3859387740).

Almost surely, 2^51211105515 is an apocalyptic number.

51211105515 is a deficient number, since it is larger than the sum of its proper divisors (41414200245).

51211105515 is a wasteful number, since it uses less digits than its factorization.

51211105515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49479363 (or 49479360 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 27.

The spelling of 51211105515 in words is "fifty-one billion, two hundred eleven million, one hundred five thousand, five hundred fifteen".