665615500159 has 2 divisors, whose sum is σ = 665615500160. Its totient is φ = 665615500158.

The previous prime is 665615500153. The next prime is 665615500169. The reversal of 665615500159 is 951005516566.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665615500159 - 2¹⁷ = 665615369087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665615500153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332807750079 + 332807750080.

It is an arithmetic number, because the mean of its divisors is an integer number (332807750080).

Almost surely, 2^665615500159 is an apocalyptic number.

665615500159 is a deficient number, since it is larger than the sum of its proper divisors (1).

665615500159 is an equidigital number, since it uses as much as digits as its factorization.

665615500159 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1215000, while the sum is 49.

The spelling of 665615500159 in words is "six hundred sixty-five billion, six hundred fifteen million, five hundred thousand, one hundred fifty-nine".