669925479168 has 1152 divisors, whose sum is σ = 2355629875200. Its totient is φ = 189684633600.

The previous prime is 669925479143. The next prime is 669925479169. The reversal of 669925479168 is 861974529966.

669925479168 is a `hidden beast` number, since 6 + 6 + 9 + 92 + 5 + 479 + 1 + 68 = 666.

669925479168 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (1152).

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

It is a junction number, because it is equal to n+sod(n) for n = 669925479096 and 669925479105.

It is not an unprimeable number, because it can be changed into a prime (669925479169) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 21610499313 + ... + 21610499343.

It is an arithmetic number, because the mean of its divisors is an integer number (2044817600).

Almost surely, 2^669925479168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669925479168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1177814937600).

669925479168 is an abundant number, since it is smaller than the sum of its proper divisors (1685704396032).

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

669925479168 is an frugal number, since it uses more digits than its factorization.

669925479168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130 (or 76 counting only the distinct ones).

The product of its digits is 352719360, while the sum is 72.

The spelling of 669925479168 in words is "six hundred sixty-nine billion, nine hundred twenty-five million, four hundred seventy-nine thousand, one hundred sixty-eight".