666404627322555 has 96 divisors (see below), whose sum is σ = 1275311980470528. Its totient is φ = 319221176544000.

The previous prime is 666404627322487. The next prime is 666404627322593. The reversal of 666404627322555 is 555223726404666.

It is not a de Polignac number, because 666404627322555 - 2²⁷ = 666404493104827 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666404627322492 and 666404627322501.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9076332 + ... + 37618998.

It is an arithmetic number, because the mean of its divisors is an integer number (13284499796568).

Almost surely, 2^{666404627322555} is an apocalyptic number.

666404627322555 is a deficient number, since it is larger than the sum of its proper divisors (608907353147973).

666404627322555 is a wasteful number, since it uses less digits than its factorization.

666404627322555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28543257 (or 28543254 counting only the distinct ones).

The product of its (nonzero) digits is 435456000, while the sum is 63.

The spelling of 666404627322555 in words is "six hundred sixty-six trillion, four hundred four billion, six hundred twenty-seven million, three hundred twenty-two thousand, five hundred fifty-five".