657376381 has 2 divisors, whose sum is σ = 657376382. Its totient is φ = 657376380.

The previous prime is 657376309. The next prime is 657376387. The reversal of 657376381 is 183673756.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 626751225 + 30625156 = 25035^2 + 5534^2 .

It is a cyclic number.

It is not a de Polignac number, because 657376381 - 2²⁷ = 523158653 is a prime.

It is a super-2 number, since 2×657376381² = 864287412593314322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (657376387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328688190 + 328688191.

It is an arithmetic number, because the mean of its divisors is an integer number (328688191).

Almost surely, 2^657376381 is an apocalyptic number.

It is an amenable number.

657376381 is a deficient number, since it is larger than the sum of its proper divisors (1).

657376381 is an equidigital number, since it uses as much as digits as its factorization.

657376381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 635040, while the sum is 46.

The square root of 657376381 is about 25639.3521954046. The cubic root of 657376381 is about 869.5035618469.

The spelling of 657376381 in words is "six hundred fifty-seven million, three hundred seventy-six thousand, three hundred eighty-one".