2152637657 has 4 divisors (see below), whose sum is σ = 2153977140. Its totient is φ = 2151298176.

The previous prime is 2152637611. The next prime is 2152637671. The reversal of 2152637657 is 7567362512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2101672336 + 50965321 = 45844^2 + 7139^2 .

It is a cyclic number.

It is not a de Polignac number, because 2152637657 - 2⁶ = 2152637593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2152637957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 667328 + ... + 670545.

It is an arithmetic number, because the mean of its divisors is an integer number (538494285).

Almost surely, 2^2152637657 is an apocalyptic number.

It is an amenable number.

2152637657 is a deficient number, since it is larger than the sum of its proper divisors (1339483).

2152637657 is a wasteful number, since it uses less digits than its factorization.

2152637657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1339482.

The product of its digits is 529200, while the sum is 44.

The square root of 2152637657 is about 46396.5263462686. The cubic root of 2152637657 is about 1291.1904674598.

The spelling of 2152637657 in words is "two billion, one hundred fifty-two million, six hundred thirty-seven thousand, six hundred fifty-seven".