666981165590 has 16 divisors (see below), whose sum is σ = 1218484996272. Its totient is φ = 262810488864.

The previous prime is 666981165541. The next prime is 666981165619. The reversal of 666981165590 is 95561189666.

666981165590 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 497746469 + ... + 497747808.

It is an arithmetic number, because the mean of its divisors is an integer number (76155312267).

Almost surely, 2^666981165590 is an apocalyptic number.

666981165590 is a deficient number, since it is larger than the sum of its proper divisors (551503830682).

666981165590 is a wasteful number, since it uses less digits than its factorization.

666981165590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995494351.

The product of its (nonzero) digits is 20995200, while the sum is 62.

The spelling of 666981165590 in words is "six hundred sixty-six billion, nine hundred eighty-one million, one hundred sixty-five thousand, five hundred ninety".