666235755264601 has 4 divisors (see below), whose sum is σ = 667029838406400. Its totient is φ = 665441672122804.

The previous prime is 666235755264593. The next prime is 666235755264697. The reversal of 666235755264601 is 106462557532666.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 666235755264601 - 2³ = 666235755264593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666235755264301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 397041569641 + ... + 397041571318.

It is an arithmetic number, because the mean of its divisors is an integer number (166757459601600).

Almost surely, 2^{666235755264601} is an apocalyptic number.

It is an amenable number.

666235755264601 is a deficient number, since it is larger than the sum of its proper divisors (794083141799).

666235755264601 is an equidigital number, since it uses as much as digits as its factorization.

666235755264601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794083141798.

The product of its (nonzero) digits is 326592000, while the sum is 64.

The spelling of 666235755264601 in words is "six hundred sixty-six trillion, two hundred thirty-five billion, seven hundred fifty-five million, two hundred sixty-four thousand, six hundred one".