657155045641 has 2 divisors, whose sum is σ = 657155045642. Its totient is φ = 657155045640.

The previous prime is 657155045611. The next prime is 657155045647. The reversal of 657155045641 is 146540551756.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 546601455625 + 110553590016 = 739325^2 + 332496^2 .

It is a cyclic number.

It is not a de Polignac number, because 657155045641 - 2¹⁵ = 657155012873 is a prime.

It is a super-2 number, since 2×657155045641² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (657155045647) 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, 328577522820 + 328577522821.

It is an arithmetic number, because the mean of its divisors is an integer number (328577522821).

Almost surely, 2^657155045641 is an apocalyptic number.

It is an amenable number.

657155045641 is a deficient number, since it is larger than the sum of its proper divisors (1).

657155045641 is an equidigital number, since it uses as much as digits as its factorization.

657155045641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520000, while the sum is 49.

The spelling of 657155045641 in words is "six hundred fifty-seven billion, one hundred fifty-five million, forty-five thousand, six hundred forty-one".