66868474772 has 24 divisors (see below), whose sum is σ = 128118879840. Its totient is φ = 30285027360.

The previous prime is 66868474759. The next prime is 66868474811. The reversal of 66868474772 is 27747486866.

It is a junction number, because it is equal to n+sod(n) for n = 66868474699 and 66868474708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2731022 + ... + 2755397.

It is an arithmetic number, because the mean of its divisors is an integer number (5338286660).

Almost surely, 2^66868474772 is an apocalyptic number.

It is an amenable number.

66868474772 is a deficient number, since it is larger than the sum of its proper divisors (61250405068).

66868474772 is a wasteful number, since it uses less digits than its factorization.

66868474772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5486711 (or 5486709 counting only the distinct ones).

The product of its digits is 151732224, while the sum is 65.

The spelling of 66868474772 in words is "sixty-six billion, eight hundred sixty-eight million, four hundred seventy-four thousand, seven hundred seventy-two".