666055720101 has 8 divisors (see below), whose sum is σ = 888078147264. Its totient is φ = 444035219840.

The previous prime is 666055720069. The next prime is 666055720103. The reversal of 666055720101 is 101027550666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 666055720101 - 2⁵ = 666055720069 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 666055720101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666055720103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 853621 + ... + 1435541.

It is an arithmetic number, because the mean of its divisors is an integer number (111009768408).

Almost surely, 2^666055720101 is an apocalyptic number.

It is an amenable number.

666055720101 is a deficient number, since it is larger than the sum of its proper divisors (222022427163).

666055720101 is a wasteful number, since it uses less digits than its factorization.

666055720101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963451.

The product of its (nonzero) digits is 75600, while the sum is 39.

The spelling of 666055720101 in words is "six hundred sixty-six billion, fifty-five million, seven hundred twenty thousand, one hundred one".