2015997158091 has 16 divisors (see below), whose sum is σ = 3252701297664. Its totient is φ = 1084233765504.

The previous prime is 2015997158089. The next prime is 2015997158099. The reversal of 2015997158091 is 1908517995102.

It is not a de Polignac number, because 2015997158091 - 2¹ = 2015997158089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2015997158099) 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, 2823525075 + ... + 2823525788.

It is an arithmetic number, because the mean of its divisors is an integer number (203293831104).

Almost surely, 2^{2015997158091} is an apocalyptic number.

2015997158091 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2015997158091 is a deficient number, since it is larger than the sum of its proper divisors (1236704139573).

2015997158091 is a wasteful number, since it uses less digits than its factorization.

2015997158091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5647050890.

The product of its (nonzero) digits is 2041200, while the sum is 57.

The spelling of 2015997158091 in words is "two trillion, fifteen billion, nine hundred ninety-seven million, one hundred fifty-eight thousand, ninety-one".