51115015987 has 16 divisors (see below), whose sum is σ = 59883812352. Its totient is φ = 42714377280.

The previous prime is 51115015949. The next prime is 51115015993. The reversal of 51115015987 is 78951051115.

It is not a de Polignac number, because 51115015987 - 2³⁵ = 16755277619 is a prime.

It is a super-2 number, since 2×51115015987² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51115015997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 353748 + ... + 476830.

It is an arithmetic number, because the mean of its divisors is an integer number (3742738272).

Almost surely, 2^51115015987 is an apocalyptic number.

51115015987 is a deficient number, since it is larger than the sum of its proper divisors (8768796365).

51115015987 is a wasteful number, since it uses less digits than its factorization.

51115015987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124578.

The product of its (nonzero) digits is 63000, while the sum is 43.

The spelling of 51115015987 in words is "fifty-one billion, one hundred fifteen million, fifteen thousand, nine hundred eighty-seven".