666121746525466 has 256 divisors, whose sum is σ = 1319980901990400. Its totient is φ = 244247967129600.

The previous prime is 666121746525451. The next prime is 666121746525481. The reversal of 666121746525466 is 664525647121666.

It is an interprime number because it is at equal distance from previous prime (666121746525451) and next prime (666121746525481).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 577729181146 + ... + 577729182298.

It is an arithmetic number, because the mean of its divisors is an integer number (5156175398400).

Almost surely, 2^{666121746525466} is an apocalyptic number.

666121746525466 is a deficient number, since it is larger than the sum of its proper divisors (653859155464934).

666121746525466 is a wasteful number, since it uses less digits than its factorization.

666121746525466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3105.

The product of its digits is 522547200, while the sum is 67.

The spelling of 666121746525466 in words is "six hundred sixty-six trillion, one hundred twenty-one billion, seven hundred forty-six million, five hundred twenty-five thousand, four hundred sixty-six".