51521881859 has 16 divisors (see below), whose sum is σ = 60794966016. Its totient is φ = 42727629600.

The previous prime is 51521881849. The next prime is 51521881877. The reversal of 51521881859 is 95818812515.

It is a cyclic number.

It is not a de Polignac number, because 51521881859 - 2²⁰ = 51520833283 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51521881859.

It is not an unprimeable number, because it can be changed into a prime (51521881849) 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, 1065914 + ... + 1113200.

It is an arithmetic number, because the mean of its divisors is an integer number (3799685376).

Almost surely, 2^51521881859 is an apocalyptic number.

51521881859 is a deficient number, since it is larger than the sum of its proper divisors (9273084157).

51521881859 is a wasteful number, since it uses less digits than its factorization.

51521881859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52346.

The product of its digits is 1152000, while the sum is 53.

The spelling of 51521881859 in words is "fifty-one billion, five hundred twenty-one million, eight hundred eighty-one thousand, eight hundred fifty-nine".