51638062442 has 4 divisors (see below), whose sum is σ = 77457093666. Its totient is φ = 25819031220.

The previous prime is 51638062391. The next prime is 51638062451. The reversal of 51638062442 is 24426083615.

51638062442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 33874770601 + 17763291841 = 184051^2 + 133279^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51638062442.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12909515609 + ... + 12909515612.

Almost surely, 2^51638062442 is an apocalyptic number.

51638062442 is a deficient number, since it is larger than the sum of its proper divisors (25819031224).

51638062442 is a wasteful number, since it uses less digits than its factorization.

51638062442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25819031223.

The product of its (nonzero) digits is 276480, while the sum is 41.

The spelling of 51638062442 in words is "fifty-one billion, six hundred thirty-eight million, sixty-two thousand, four hundred forty-two".