2128694601637 has 2 divisors, whose sum is σ = 2128694601638. Its totient is φ = 2128694601636.

The previous prime is 2128694601599. The next prime is 2128694601731. The reversal of 2128694601637 is 7361064968212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1976833188001 + 151861413636 = 1405999^2 + 389694^2 .

It is a cyclic number.

It is not a de Polignac number, because 2128694601637 - 2²⁷ = 2128560383909 is a prime.

It is a super-2 number, since 2×2128694601637² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2128694601037) 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, 1064347300818 + 1064347300819.

It is an arithmetic number, because the mean of its divisors is an integer number (1064347300819).

Almost surely, 2^{2128694601637} is an apocalyptic number.

It is an amenable number.

2128694601637 is a deficient number, since it is larger than the sum of its proper divisors (1).

2128694601637 is an equidigital number, since it uses as much as digits as its factorization.

2128694601637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5225472, while the sum is 55.

The spelling of 2128694601637 in words is "two trillion, one hundred twenty-eight billion, six hundred ninety-four million, six hundred one thousand, six hundred thirty-seven".