51540457518815 has 8 divisors (see below), whose sum is σ = 65103735813360. Its totient is φ = 39062241487872.

The previous prime is 51540457518773. The next prime is 51540457518829. The reversal of 51540457518815 is 51881575404515.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51540457518815 - 2⁸ = 51540457518559 is a prime.

It is a super-2 number, since 2×51540457518815² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 271265565794 + ... + 271265565983.

It is an arithmetic number, because the mean of its divisors is an integer number (8137966976670).

Almost surely, 2^{51540457518815} is an apocalyptic number.

51540457518815 is a deficient number, since it is larger than the sum of its proper divisors (13563278294545).

51540457518815 is a wasteful number, since it uses less digits than its factorization.

51540457518815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542531131801.

The product of its (nonzero) digits is 22400000, while the sum is 59.

The spelling of 51540457518815 in words is "fifty-one trillion, five hundred forty billion, four hundred fifty-seven million, five hundred eighteen thousand, eight hundred fifteen".