51564416194 has 4 divisors (see below), whose sum is σ = 77346624294. Its totient is φ = 25782208096.

The previous prime is 51564416161. The next prime is 51564416209. The reversal of 51564416194 is 49161446515.

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., 35273722969 + 16290693225 = 187813^2 + 127635^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12891104047 + ... + 12891104050.

Almost surely, 2^51564416194 is an apocalyptic number.

51564416194 is a deficient number, since it is larger than the sum of its proper divisors (25782208100).

51564416194 is a wasteful number, since it uses less digits than its factorization.

51564416194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25782208099.

The product of its digits is 518400, while the sum is 46.

The spelling of 51564416194 in words is "fifty-one billion, five hundred sixty-four million, four hundred sixteen thousand, one hundred ninety-four".