666959688902 has 16 divisors (see below), whose sum is σ = 1077452796672. Its totient is φ = 307811441280.

The previous prime is 666959688887. The next prime is 666959688907. The reversal of 666959688902 is 209886959666.

666959688902 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 666959688902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666959688907) 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, 157283 + ... + 1165614.

It is an arithmetic number, because the mean of its divisors is an integer number (67340799792).

Almost surely, 2^666959688902 is an apocalyptic number.

666959688902 is a deficient number, since it is larger than the sum of its proper divisors (410493107770).

666959688902 is a wasteful number, since it uses less digits than its factorization.

666959688902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1342303.

The product of its (nonzero) digits is 604661760, while the sum is 74.

Adding to 666959688902 its sum of digits (74), we get a square (666959688976 = 816676²).

The spelling of 666959688902 in words is "six hundred sixty-six billion, nine hundred fifty-nine million, six hundred eighty-eight thousand, nine hundred two".