2155605637 has 2 divisors, whose sum is σ = 2155605638. Its totient is φ = 2155605636.

The previous prime is 2155605631. The next prime is 2155605659. The reversal of 2155605637 is 7365065512.

2155605637 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1447726401 + 707879236 = 38049^2 + 26606^2 .

It is a cyclic number.

It is not a de Polignac number, because 2155605637 - 2¹¹ = 2155603589 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2155605637.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2155605631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077802818 + 1077802819.

It is an arithmetic number, because the mean of its divisors is an integer number (1077802819).

Almost surely, 2^2155605637 is an apocalyptic number.

It is an amenable number.

2155605637 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155605637 is an equidigital number, since it uses as much as digits as its factorization.

2155605637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 189000, while the sum is 40.

The square root of 2155605637 is about 46428.5002665389. The cubic root of 2155605637 is about 1291.7836107249.

The spelling of 2155605637 in words is "two billion, one hundred fifty-five million, six hundred five thousand, six hundred thirty-seven".