3121660566 has 32 divisors (see below), whose sum is σ = 6951934080. Its totient is φ = 1038316968.

The previous prime is 3121660561. The next prime is 3121660603. The reversal of 3121660566 is 6650661213.

3121660566 is a `hidden beast` number, since 31 + 2 + 1 + 6 + 60 + 566 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 3121660566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121660561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36676 + ... + 87111.

It is an arithmetic number, because the mean of its divisors is an integer number (217247940).

Almost surely, 2^3121660566 is an apocalyptic number.

3121660566 is an abundant number, since it is smaller than the sum of its proper divisors (3830273514).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3121660566 is a wasteful number, since it uses less digits than its factorization.

3121660566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124265 (or 124259 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 3121660566 is about 55871.8226479144. The cubic root of 3121660566 is about 1461.4879067322.

The spelling of 3121660566 in words is "three billion, one hundred twenty-one million, six hundred sixty thousand, five hundred sixty-six".