657641253 has 4 divisors (see below), whose sum is σ = 876855008. Its totient is φ = 438427500.

The previous prime is 657641251. The next prime is 657641261. The reversal of 657641253 is 352146756.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 657641253 - 2¹ = 657641251 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (657641251) 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, 109606873 + ... + 109606878.

It is an arithmetic number, because the mean of its divisors is an integer number (219213752).

Almost surely, 2^657641253 is an apocalyptic number.

It is an amenable number.

657641253 is a deficient number, since it is larger than the sum of its proper divisors (219213755).

657641253 is a wasteful number, since it uses less digits than its factorization.

657641253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219213754.

The product of its digits is 151200, while the sum is 39.

The square root of 657641253 is about 25644.5170163136. The cubic root of 657641253 is about 869.6203271323.

The spelling of 657641253 in words is "six hundred fifty-seven million, six hundred forty-one thousand, two hundred fifty-three".