51895505138 has 32 divisors (see below), whose sum is σ = 78774936240. Its totient is φ = 25639649280.

The previous prime is 51895505113. The next prime is 51895505149. The reversal of 51895505138 is 83150559815.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 789216649 + 51106288489 = 28093^2 + 226067^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67484018 + ... + 67484786.

Almost surely, 2^51895505138 is an apocalyptic number.

51895505138 is a deficient number, since it is larger than the sum of its proper divisors (26879431102).

51895505138 is a wasteful number, since it uses less digits than its factorization.

51895505138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1902.

The product of its (nonzero) digits is 1080000, while the sum is 50.

The spelling of 51895505138 in words is "fifty-one billion, eight hundred ninety-five million, five hundred five thousand, one hundred thirty-eight".