666002475561 has 4 divisors (see below), whose sum is σ = 888003300752. Its totient is φ = 444001650372.

The previous prime is 666002475529. The next prime is 666002475563. The reversal of 666002475561 is 165574200666.

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 not a de Polignac number, because 666002475561 - 2⁵ = 666002475529 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 666002475561.

It is not an unprimeable number, because it can be changed into a prime (666002475563) 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, 111000412591 + ... + 111000412596.

It is an arithmetic number, because the mean of its divisors is an integer number (222000825188).

Almost surely, 2^666002475561 is an apocalyptic number.

It is an amenable number.

666002475561 is a deficient number, since it is larger than the sum of its proper divisors (222000825191).

666002475561 is a wasteful number, since it uses less digits than its factorization.

666002475561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222000825190.

The product of its (nonzero) digits is 1814400, while the sum is 48.

The spelling of 666002475561 in words is "six hundred sixty-six billion, two million, four hundred seventy-five thousand, five hundred sixty-one".