51005055016557 has 6 divisors (see below), whose sum is σ = 73673968357262. Its totient is φ = 34003370011032.

The previous prime is 51005055016549. The next prime is 51005055016609. The reversal of 51005055016557 is 75561055050015.

It can be written as a sum of positive squares in only one way, i.e., 46151519967081 + 4853535049476 = 6793491^2 + 2203074^2 .

It is not a de Polignac number, because 51005055016557 - 2³ = 51005055016549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51005055015557) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2833614167578 + ... + 2833614167595.

Almost surely, 2^{51005055016557} is an apocalyptic number.

It is an amenable number.

51005055016557 is a deficient number, since it is larger than the sum of its proper divisors (22668913340705).

51005055016557 is a wasteful number, since it uses less digits than its factorization.

51005055016557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5667228335179 (or 5667228335176 counting only the distinct ones).

The product of its (nonzero) digits is 656250, while the sum is 45.

The spelling of 51005055016557 in words is "fifty-one trillion, five billion, fifty-five million, sixteen thousand, five hundred fifty-seven".