666594835961 has 4 divisors (see below), whose sum is σ = 666598074000. Its totient is φ = 666591597924.

The previous prime is 666594835943. The next prime is 666594835987. The reversal of 666594835961 is 169538495666.

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 666594835961 - 2¹⁴ = 666594819577 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666594835891 and 666594835900.

It is not an unprimeable number, because it can be changed into a prime (666594835261) 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, 1287611 + ... + 1729488.

It is an arithmetic number, because the mean of its divisors is an integer number (166649518500).

Almost surely, 2^666594835961 is an apocalyptic number.

It is an amenable number.

666594835961 is a deficient number, since it is larger than the sum of its proper divisors (3238039).

666594835961 is a wasteful number, since it uses less digits than its factorization.

666594835961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3238038.

The product of its digits is 251942400, while the sum is 68.

The spelling of 666594835961 in words is "six hundred sixty-six billion, five hundred ninety-four million, eight hundred thirty-five thousand, nine hundred sixty-one".