51052557517 has 4 divisors (see below), whose sum is σ = 54979677340. Its totient is φ = 47125437696.

The previous prime is 51052557503. The next prime is 51052557581. The reversal of 51052557517 is 71575525015.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14211977796 + 36840579721 = 119214^2 + 191939^2 .

It is a cyclic number.

It is not a de Polignac number, because 51052557517 - 2¹¹ = 51052555469 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 (51052557317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1963559892 + ... + 1963559917.

It is an arithmetic number, because the mean of its divisors is an integer number (13744919335).

Almost surely, 2^51052557517 is an apocalyptic number.

It is an amenable number.

51052557517 is a deficient number, since it is larger than the sum of its proper divisors (3927119823).

51052557517 is a wasteful number, since it uses less digits than its factorization.

51052557517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3927119822.

The product of its (nonzero) digits is 306250, while the sum is 43.

The spelling of 51052557517 in words is "fifty-one billion, fifty-two million, five hundred fifty-seven thousand, five hundred seventeen".