665615500166 has 16 divisors (see below), whose sum is σ = 1017289749024. Its totient is φ = 326519266944.

The previous prime is 665615500159. The next prime is 665615500169. The reversal of 665615500166 is 661005516566.

665615500166 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×665615500166² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 665615500166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665615500169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5291150 + ... + 5415486.

It is an arithmetic number, because the mean of its divisors is an integer number (63580609314).

Almost surely, 2^665615500166 is an apocalyptic number.

665615500166 is a deficient number, since it is larger than the sum of its proper divisors (351674248858).

665615500166 is a wasteful number, since it uses less digits than its factorization.

665615500166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174895.

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 665615500166 in words is "six hundred sixty-five billion, six hundred fifteen million, five hundred thousand, one hundred sixty-six".