664996969157 has 2 divisors, whose sum is σ = 664996969158. Its totient is φ = 664996969156.

The previous prime is 664996969151. The next prime is 664996969213. The reversal of 664996969157 is 751969699466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 463387887076 + 201609082081 = 680726^2 + 449009^2 .

It is a cyclic number.

It is not a de Polignac number, because 664996969157 - 2¹⁴ = 664996952773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664996969151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332498484578 + 332498484579.

It is an arithmetic number, because the mean of its divisors is an integer number (332498484579).

Almost surely, 2^664996969157 is an apocalyptic number.

It is an amenable number.

664996969157 is a deficient number, since it is larger than the sum of its proper divisors (1).

664996969157 is an equidigital number, since it uses as much as digits as its factorization.

664996969157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1190427840, while the sum is 77.

The spelling of 664996969157 in words is "six hundred sixty-four billion, nine hundred ninety-six million, nine hundred sixty-nine thousand, one hundred fifty-seven".