664577070551591 has 2 divisors, whose sum is σ = 664577070551592. Its totient is φ = 664577070551590.

The previous prime is 664577070551587. The next prime is 664577070551651. The reversal of 664577070551591 is 195155070775466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664577070551591 - 2² = 664577070551587 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664577070551491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332288535275795 + 332288535275796.

It is an arithmetic number, because the mean of its divisors is an integer number (332288535275796).

Almost surely, 2^{664577070551591} is an apocalyptic number.

664577070551591 is a deficient number, since it is larger than the sum of its proper divisors (1).

664577070551591 is an equidigital number, since it uses as much as digits as its factorization.

664577070551591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 277830000, while the sum is 68.

The spelling of 664577070551591 in words is "six hundred sixty-four trillion, five hundred seventy-seven billion, seventy million, five hundred fifty-one thousand, five hundred ninety-one".