656116666001 has 4 divisors (see below), whose sum is σ = 661923008292. Its totient is φ = 650310323712.

The previous prime is 656116665991. The next prime is 656116666151. The reversal of 656116666001 is 100666611656.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50445160000 + 605671506001 = 224600^2 + 778249^2 .

It is a cyclic number.

It is not a de Polignac number, because 656116666001 - 2¹⁰ = 656116664977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656116606001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2903170976 + ... + 2903171201.

It is an arithmetic number, because the mean of its divisors is an integer number (165480752073).

Almost surely, 2^656116666001 is an apocalyptic number.

It is an amenable number.

656116666001 is a deficient number, since it is larger than the sum of its proper divisors (5806342291).

656116666001 is a wasteful number, since it uses less digits than its factorization.

656116666001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5806342290.

The product of its (nonzero) digits is 233280, while the sum is 44.

The spelling of 656116666001 in words is "six hundred fifty-six billion, one hundred sixteen million, six hundred sixty-six thousand, one".