657378013 has 4 divisors (see below), whose sum is σ = 658330048. Its totient is φ = 656425980.

The previous prime is 657377999. The next prime is 657378031. The reversal of 657378013 is 310873756.

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 a cyclic number.

It is not a de Polignac number, because 657378013 - 2²⁵ = 623823581 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 (657378713) 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, 474981 + ... + 476362.

It is an arithmetic number, because the mean of its divisors is an integer number (164582512).

Almost surely, 2^657378013 is an apocalyptic number.

It is an amenable number.

657378013 is a deficient number, since it is larger than the sum of its proper divisors (952035).

657378013 is an equidigital number, since it uses as much as digits as its factorization.

657378013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952034.

The product of its (nonzero) digits is 105840, while the sum is 40.

The square root of 657378013 is about 25639.3840214620. The cubic root of 657378013 is about 869.5042813883.

The spelling of 657378013 in words is "six hundred fifty-seven million, three hundred seventy-eight thousand, thirteen".