657440051 has 2 divisors, whose sum is σ = 657440052. Its totient is φ = 657440050.

The previous prime is 657440041. The next prime is 657440059. The reversal of 657440051 is 150044756.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 657440051 - 2⁶ = 657439987 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (657440059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328720025 + 328720026.

It is an arithmetic number, because the mean of its divisors is an integer number (328720026).

Almost surely, 2^657440051 is an apocalyptic number.

657440051 is a deficient number, since it is larger than the sum of its proper divisors (1).

657440051 is an equidigital number, since it uses as much as digits as its factorization.

657440051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 657440051 is about 25640.5938113765. The cubic root of 657440051 is about 869.5316327796.

The spelling of 657440051 in words is "six hundred fifty-seven million, four hundred forty thousand, fifty-one".