666207521126 has 16 divisors (see below), whose sum is σ = 1142324899584. Its totient is φ = 285453793224.

The previous prime is 666207521093. The next prime is 666207521167. The reversal of 666207521126 is 621125702666.

It is a super-2 number, since 2×666207521126² (a number of 24 digits) contains 22 as substring.

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, 5244650 + ... + 5370173.

It is an arithmetic number, because the mean of its divisors is an integer number (71395306224).

Almost surely, 2^666207521126 is an apocalyptic number.

666207521126 is a deficient number, since it is larger than the sum of its proper divisors (476117378458).

666207521126 is a wasteful number, since it uses less digits than its factorization.

666207521126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10619315.

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 666207521126 in words is "six hundred sixty-six billion, two hundred seven million, five hundred twenty-one thousand, one hundred twenty-six".