2158814787591 has 16 divisors (see below), whose sum is σ = 3588679127808. Its totient is φ = 1121462227200.

The previous prime is 2158814787587. The next prime is 2158814787617. The reversal of 2158814787591 is 1957874188512.

It is not a de Polignac number, because 2158814787591 - 2² = 2158814787587 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2158814787541) 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, 4672759050 + ... + 4672759511.

It is an arithmetic number, because the mean of its divisors is an integer number (224292445488).

Almost surely, 2^{2158814787591} is an apocalyptic number.

2158814787591 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2158814787591 is a deficient number, since it is larger than the sum of its proper divisors (1429864340217).

2158814787591 is a wasteful number, since it uses less digits than its factorization.

2158814787591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9345518582.

The product of its digits is 45158400, while the sum is 66.

The spelling of 2158814787591 in words is "two trillion, one hundred fifty-eight billion, eight hundred fourteen million, seven hundred eighty-seven thousand, five hundred ninety-one".