51197561875 has 10 divisors (see below), whose sum is σ = 63976474100. Its totient is φ = 40958049000.

The previous prime is 51197561801. The next prime is 51197561881. The reversal of 51197561875 is 57816579115.

It is not a de Polignac number, because 51197561875 - 2¹¹ = 51197559827 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 40957425 + ... + 40958674.

It is an arithmetic number, because the mean of its divisors is an integer number (6397647410).

Almost surely, 2^51197561875 is an apocalyptic number.

51197561875 is a deficient number, since it is larger than the sum of its proper divisors (12778912225).

51197561875 is an frugal number, since it uses more digits than its factorization.

51197561875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81916119 (or 81916104 counting only the distinct ones).

The product of its digits is 2646000, while the sum is 55.

The spelling of 51197561875 in words is "fifty-one billion, one hundred ninety-seven million, five hundred sixty-one thousand, eight hundred seventy-five".