115516516505551 has 4 divisors (see below), whose sum is σ = 132018876006352. Its totient is φ = 99014157004752.

The previous prime is 115516516505539. The next prime is 115516516505609. The reversal of 115516516505551 is 155505615615511.

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

It is a cyclic number.

It is not a de Polignac number, because 115516516505551 - 2⁴¹ = 113317493249999 is a prime.

It is a super-3 number, since 3×115516516505551³ (a number of 43 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115516516505521) 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, 8251179750390 + ... + 8251179750403.

It is an arithmetic number, because the mean of its divisors is an integer number (33004719001588).

Almost surely, 2^{115516516505551} is an apocalyptic number.

115516516505551 is a deficient number, since it is larger than the sum of its proper divisors (16502359500801).

115516516505551 is an equidigital number, since it uses as much as digits as its factorization.

115516516505551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16502359500800.

The product of its (nonzero) digits is 2812500, while the sum is 52.

The spelling of 115516516505551 in words is "one hundred fifteen trillion, five hundred sixteen billion, five hundred sixteen million, five hundred five thousand, five hundred fifty-one".