2100757657 has 4 divisors (see below), whose sum is σ = 2106049636. Its totient is φ = 2095465680.

The previous prime is 2100757627. The next prime is 2100757697. The reversal of 2100757657 is 7567570012.

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 511619161 + 1589138496 = 22619^2 + 39864^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100757657 - 2²⁷ = 1966539929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2100757627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2645394 + ... + 2646187.

It is an arithmetic number, because the mean of its divisors is an integer number (526512409).

Almost surely, 2^2100757657 is an apocalyptic number.

It is an amenable number.

2100757657 is a deficient number, since it is larger than the sum of its proper divisors (5291979).

2100757657 is an equidigital number, since it uses as much as digits as its factorization.

2100757657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5291978.

The product of its (nonzero) digits is 102900, while the sum is 40.

The square root of 2100757657 is about 45834.0229196609. The cubic root of 2100757657 is about 1280.7331527824.

The spelling of 2100757657 in words is "two billion, one hundred million, seven hundred fifty-seven thousand, six hundred fifty-seven".