666455413767201 has 6 divisors (see below), whose sum is σ = 962657819885970. Its totient is φ = 444303609178128.

The previous prime is 666455413767193. The next prime is 666455413767211. The reversal of 666455413767201 is 102767314554666.

It can be written as a sum of positive squares in only one way, i.e., 585359265251601 + 81096148515600 = 24194199^2 + 9005340^2 .

It is not a de Polignac number, because 666455413767201 - 2³ = 666455413767193 is a prime.

It is a super-2 number, since 2×666455413767201² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (666455413767211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37025300764836 + ... + 37025300764853.

It is an arithmetic number, because the mean of its divisors is an integer number (160442969980995).

Almost surely, 2^{666455413767201} is an apocalyptic number.

It is an amenable number.

666455413767201 is a deficient number, since it is larger than the sum of its proper divisors (296202406118769).

666455413767201 is a wasteful number, since it uses less digits than its factorization.

666455413767201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74050601529695 (or 74050601529692 counting only the distinct ones).

The product of its (nonzero) digits is 152409600, while the sum is 63.

The spelling of 666455413767201 in words is "six hundred sixty-six trillion, four hundred fifty-five billion, four hundred thirteen million, seven hundred sixty-seven thousand, two hundred one".