666556601516 has 48 divisors (see below), whose sum is σ = 1258754296800. Its totient is φ = 307017257472.

The previous prime is 666556601509. The next prime is 666556601527. The reversal of 666556601516 is 615106655666.

It is a happy number.

It is a super-2 number, since 2×666556601516² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66590720 + ... + 66600728.

It is an arithmetic number, because the mean of its divisors is an integer number (26224047850).

Almost surely, 2^666556601516 is an apocalyptic number.

It is an amenable number.

666556601516 is a deficient number, since it is larger than the sum of its proper divisors (592197695284).

666556601516 is a wasteful number, since it uses less digits than its factorization.

666556601516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12498 (or 12496 counting only the distinct ones).

The product of its (nonzero) digits is 5832000, while the sum is 53.

The spelling of 666556601516 in words is "six hundred sixty-six billion, five hundred fifty-six million, six hundred one thousand, five hundred sixteen".