2155951215637 has 2 divisors, whose sum is σ = 2155951215638. Its totient is φ = 2155951215636.

The previous prime is 2155951215599. The next prime is 2155951215709. The reversal of 2155951215637 is 7365121595512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2143790860561 + 12160355076 = 1464169^2 + 110274^2 .

It is a cyclic number.

It is not a de Polignac number, because 2155951215637 - 2²³ = 2155942827029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2155951212637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077975607818 + 1077975607819.

It is an arithmetic number, because the mean of its divisors is an integer number (1077975607819).

Almost surely, 2^{2155951215637} is an apocalyptic number.

It is an amenable number.

2155951215637 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155951215637 is an equidigital number, since it uses as much as digits as its factorization.

2155951215637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2835000, while the sum is 52.

The spelling of 2155951215637 in words is "two trillion, one hundred fifty-five billion, nine hundred fifty-one million, two hundred fifteen thousand, six hundred thirty-seven".