51891862032 has 50 divisors (see below), whose sum is σ = 150190107518. Its totient is φ = 17297286912.

The previous prime is 51891862021. The next prime is 51891862039. The reversal of 51891862032 is 23026819815.

51891862032 is a `hidden beast` number, since 5 + 1 + 8 + 9 + 18 + 620 + 3 + 2 = 666.

51891862032 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 50479304976 + 1412557056 = 224676^2 + 37584^2 .

It is not an unprimeable number, because it can be changed into a prime (51891862039) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 20018713 + ... + 20021304.

Almost surely, 2^51891862032 is an apocalyptic number.

It is an amenable number.

51891862032 is an abundant number, since it is smaller than the sum of its proper divisors (98298245486).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51891862032 is a wasteful number, since it uses less digits than its factorization.

51891862032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40040037 (or 40040022 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 51891862032 in words is "fifty-one billion, eight hundred ninety-one million, eight hundred sixty-two thousand, thirty-two".