51115610985 has 32 divisors (see below), whose sum is σ = 86104581120. Its totient is φ = 25822296000.

The previous prime is 51115610969. The next prime is 51115611007. The reversal of 51115610985 is 58901651115.

It is not a de Polignac number, because 51115610985 - 2⁴ = 51115610969 is a prime.

It is a super-2 number, since 2×51115610985² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2111500 + ... + 2135570.

It is an arithmetic number, because the mean of its divisors is an integer number (2690768160).

Almost surely, 2^51115610985 is an apocalyptic number.

It is an amenable number.

51115610985 is a deficient number, since it is larger than the sum of its proper divisors (34988970135).

51115610985 is a wasteful number, since it uses less digits than its factorization.

51115610985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31549.

The product of its (nonzero) digits is 54000, while the sum is 42.

The spelling of 51115610985 in words is "fifty-one billion, one hundred fifteen million, six hundred ten thousand, nine hundred eighty-five".