66257661124 has 12 divisors (see below), whose sum is σ = 116031831804. Its totient is φ = 33105709184.

The previous prime is 66257661103. The next prime is 66257661149. The reversal of 66257661124 is 42116675266.

It can be written as a sum of positive squares in 2 ways, for example, as 43284802500 + 22972858624 = 208050^2 + 151568^2 .

It is an unprimeable number.

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, 5773897 + ... + 5785360.

It is an arithmetic number, because the mean of its divisors is an integer number (9669319317).

Almost surely, 2^66257661124 is an apocalyptic number.

It is an amenable number.

66257661124 is a deficient number, since it is larger than the sum of its proper divisors (49774170680).

66257661124 is a wasteful number, since it uses less digits than its factorization.

66257661124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11560694 (or 11560692 counting only the distinct ones).

The product of its digits is 725760, while the sum is 46.

The spelling of 66257661124 in words is "sixty-six billion, two hundred fifty-seven million, six hundred sixty-one thousand, one hundred twenty-four".