66772410661 has 16 divisors (see below), whose sum is σ = 76222453248. Its totient is φ = 57939321600.

The previous prime is 66772410631. The next prime is 66772410673. The reversal of 66772410661 is 16601427766.

66772410661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 66772410661 - 2⁹ = 66772410149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66772410631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1316296 + ... + 1366081.

It is an arithmetic number, because the mean of its divisors is an integer number (4763903328).

Almost surely, 2^66772410661 is an apocalyptic number.

It is an amenable number.

66772410661 is a deficient number, since it is larger than the sum of its proper divisors (9450042587).

66772410661 is a wasteful number, since it uses less digits than its factorization.

66772410661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2682492.

The product of its (nonzero) digits is 508032, while the sum is 46.

The spelling of 66772410661 in words is "sixty-six billion, seven hundred seventy-two million, four hundred ten thousand, six hundred sixty-one".