665675167715501 has 2 divisors, whose sum is σ = 665675167715502. Its totient is φ = 665675167715500.

The previous prime is 665675167715491. The next prime is 665675167715531. The reversal of 665675167715501 is 105517761576566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 512662473486601 + 153012694228900 = 22642051^2 + 12369830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665675167715501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665675167715531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332837583857750 + 332837583857751.

It is an arithmetic number, because the mean of its divisors is an integer number (332837583857751).

Almost surely, 2^{665675167715501} is an apocalyptic number.

It is an amenable number.

665675167715501 is a deficient number, since it is larger than the sum of its proper divisors (1).

665675167715501 is an equidigital number, since it uses as much as digits as its factorization.

665675167715501 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 665675167715501 in words is "six hundred sixty-five trillion, six hundred seventy-five billion, one hundred sixty-seven million, seven hundred fifteen thousand, five hundred one".