666622446644 has 48 divisors (see below), whose sum is σ = 1468849527936. Its totient is φ = 257151504000.

The previous prime is 666622446643. The next prime is 666622446653. The reversal of 666622446644 is 446644226666.

666622446644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 666622446644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666622446641) 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, 10683539 + ... + 10745754.

It is an arithmetic number, because the mean of its divisors is an integer number (30601031832).

It is a self-describing number.

Almost surely, 2^666622446644 is an apocalyptic number.

It is an amenable number.

666622446644 is an abundant number, since it is smaller than the sum of its proper divisors (802227081292).

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

666622446644 is a wasteful number, since it uses less digits than its factorization.

666622446644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21429416 (or 21429414 counting only the distinct ones).

The product of its digits is 47775744, while the sum is 56.

The spelling of 666622446644 in words is "six hundred sixty-six billion, six hundred twenty-two million, four hundred forty-six thousand, six hundred forty-four".