66666477616 has 20 divisors (see below), whose sum is σ = 133332956224. Its totient is φ = 32257972800.

The previous prime is 66666477613. The next prime is 66666477623. The reversal of 66666477616 is 61677466666.

It is a happy number.

66666477616 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (66666477613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67203615 + ... + 67204606.

Almost surely, 2^66666477616 is an apocalyptic number.

It is an amenable number.

66666477616 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66666477616 is a wasteful number, since it uses less digits than its factorization.

66666477616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134408260 (or 134408254 counting only the distinct ones).

The product of its digits is 54867456, while the sum is 61.

The spelling of 66666477616 in words is "sixty-six billion, six hundred sixty-six million, four hundred seventy-seven thousand, six hundred sixteen".