657043663 has 2 divisors, whose sum is σ = 657043664. Its totient is φ = 657043662.

The previous prime is 657043649. The next prime is 657043679. The reversal of 657043663 is 366340756.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 657043663 - 2¹³ = 657035471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (657043613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328521831 + 328521832.

It is an arithmetic number, because the mean of its divisors is an integer number (328521832).

Almost surely, 2^657043663 is an apocalyptic number.

657043663 is a deficient number, since it is larger than the sum of its proper divisors (1).

657043663 is an equidigital number, since it uses as much as digits as its factorization.

657043663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 40.

The square root of 657043663 is about 25632.8629497370. The cubic root of 657043663 is about 869.3568431045.

The spelling of 657043663 in words is "six hundred fifty-seven million, forty-three thousand, six hundred sixty-three".