51055657538 has 4 divisors (see below), whose sum is σ = 76583486310. Its totient is φ = 25527828768.

The previous prime is 51055657469. The next prime is 51055657561. The reversal of 51055657538 is 83575655015.

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., 46301141329 + 4754516209 = 215177^2 + 68953^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12763914383 + ... + 12763914386.

Almost surely, 2^51055657538 is an apocalyptic number.

51055657538 is a deficient number, since it is larger than the sum of its proper divisors (25527828772).

51055657538 is a wasteful number, since it uses less digits than its factorization.

51055657538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25527828771.

The product of its (nonzero) digits is 3150000, while the sum is 50.

The spelling of 51055657538 in words is "fifty-one billion, fifty-five million, six hundred fifty-seven thousand, five hundred thirty-eight".