2516120555991 has 16 divisors (see below), whose sum is σ = 3838111674624. Its totient is φ = 1436274471744.

The previous prime is 2516120555957. The next prime is 2516120556007. The reversal of 2516120555991 is 1995550216152.

It is not a de Polignac number, because 2516120555991 - 2¹⁰ = 2516120554967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2516120555951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62842141 + ... + 62882166.

It is an arithmetic number, because the mean of its divisors is an integer number (239881979664).

Almost surely, 2^{2516120555991} is an apocalyptic number.

2516120555991 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2516120555991 is a deficient number, since it is larger than the sum of its proper divisors (1321991118633).

2516120555991 is a wasteful number, since it uses less digits than its factorization.

2516120555991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125725270.

The product of its (nonzero) digits is 1215000, while the sum is 51.

The spelling of 2516120555991 in words is "two trillion, five hundred sixteen billion, one hundred twenty million, five hundred fifty-five thousand, nine hundred ninety-one".