2155808537 has 2 divisors, whose sum is σ = 2155808538. Its totient is φ = 2155808536.

The previous prime is 2155808531. The next prime is 2155808563. The reversal of 2155808537 is 7358085512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1168340761 + 987467776 = 34181^2 + 31424^2 .

It is a cyclic number.

It is not a de Polignac number, because 2155808537 - 2¹⁴ = 2155792153 is a prime.

It is not a weakly prime, because it can be changed into another prime (2155808531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077904268 + 1077904269.

It is an arithmetic number, because the mean of its divisors is an integer number (1077904269).

Almost surely, 2^2155808537 is an apocalyptic number.

It is an amenable number.

2155808537 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155808537 is an equidigital number, since it uses as much as digits as its factorization.

2155808537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336000, while the sum is 44.

The square root of 2155808537 is about 46430.6852953949. The cubic root of 2155808537 is about 1291.8241398870.

The spelling of 2155808537 in words is "two billion, one hundred fifty-five million, eight hundred eight thousand, five hundred thirty-seven".