657788423 has 2 divisors, whose sum is σ = 657788424. Its totient is φ = 657788422.

The previous prime is 657788407. The next prime is 657788441. The reversal of 657788423 is 324887756.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 657788423 - 2⁴ = 657788407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (657788023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328894211 + 328894212.

It is an arithmetic number, because the mean of its divisors is an integer number (328894212).

Almost surely, 2^657788423 is an apocalyptic number.

657788423 is a deficient number, since it is larger than the sum of its proper divisors (1).

657788423 is an equidigital number, since it uses as much as digits as its factorization.

657788423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2257920, while the sum is 50.

The square root of 657788423 is about 25647.3862800871. The cubic root of 657788423 is about 869.6851915131.

The spelling of 657788423 in words is "six hundred fifty-seven million, seven hundred eighty-eight thousand, four hundred twenty-three".