669693839472 has 80 divisors (see below), whose sum is σ = 2196879271680. Its totient is φ = 191341096128.

The previous prime is 669693839461. The next prime is 669693839519. The reversal of 669693839472 is 274938396966.

669693839472 is a `hidden beast` number, since 6 + 6 + 96 + 9 + 38 + 39 + 472 = 666.

669693839472 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 669693839472.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110726778 + ... + 110732825.

It is an arithmetic number, because the mean of its divisors is an integer number (27460990896).

Almost surely, 2^669693839472 is an apocalyptic number.

It is an amenable number.

669693839472 is an abundant number, since it is smaller than the sum of its proper divisors (1527185432208).

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

669693839472 is a wasteful number, since it uses less digits than its factorization.

669693839472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221459627 (or 221459615 counting only the distinct ones).

The product of its digits is 634894848, while the sum is 72.

The spelling of 669693839472 in words is "six hundred sixty-nine billion, six hundred ninety-three million, eight hundred thirty-nine thousand, four hundred seventy-two".