51187478215 has 16 divisors (see below), whose sum is σ = 62780580576. Its totient is φ = 40056016000.

The previous prime is 51187478189. The next prime is 51187478231. The reversal of 51187478215 is 51287478115.

It is not a de Polignac number, because 51187478215 - 2⁵ = 51187478183 is a prime.

It is a super-2 number, since 2×51187478215² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 568696 + ... + 652525.

It is an arithmetic number, because the mean of its divisors is an integer number (3923786286).

Almost surely, 2^51187478215 is an apocalyptic number.

51187478215 is a deficient number, since it is larger than the sum of its proper divisors (11593102361).

51187478215 is a wasteful number, since it uses less digits than its factorization.

51187478215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221410.

The product of its digits is 627200, while the sum is 49.

The spelling of 51187478215 in words is "fifty-one billion, one hundred eighty-seven million, four hundred seventy-eight thousand, two hundred fifteen".