665015254161767 has 2 divisors, whose sum is σ = 665015254161768. Its totient is φ = 665015254161766.

The previous prime is 665015254161749. The next prime is 665015254161833. The reversal of 665015254161767 is 767161452510566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665015254161767 - 2¹⁶ = 665015254096231 is a prime.

It is a super-2 number, since 2×665015254161767² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665015254160767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332507627080883 + 332507627080884.

It is an arithmetic number, because the mean of its divisors is an integer number (332507627080884).

Almost surely, 2^{665015254161767} is an apocalyptic number.

665015254161767 is a deficient number, since it is larger than the sum of its proper divisors (1).

665015254161767 is an equidigital number, since it uses as much as digits as its factorization.

665015254161767 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504000, while the sum is 62.

The spelling of 665015254161767 in words is "six hundred sixty-five trillion, fifteen billion, two hundred fifty-four million, one hundred sixty-one thousand, seven hundred sixty-seven".