669921874 has 16 divisors (see below), whose sum is σ = 1103762880. Its totient is φ = 303534000.

The previous prime is 669921871. The next prime is 669921881. The reversal of 669921874 is 478129966.

It is a happy number.

It is a Cunningham number, because it is equal to 875³-1.

It is not an unprimeable number, because it can be changed into a prime (669921871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 382377 + ... + 384124.

It is an arithmetic number, because the mean of its divisors is an integer number (68985180).

Almost surely, 2^669921874 is an apocalyptic number.

669921874 is a deficient number, since it is larger than the sum of its proper divisors (433841006).

669921874 is a wasteful number, since it uses less digits than its factorization.

669921874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766545.

The product of its digits is 1306368, while the sum is 52.

The square root of 669921874 is about 25882.8490317430. The cubic root of 669921874 is about 874.9999995646. Note that the first 6 decimals are identical.

The spelling of 669921874 in words is "six hundred sixty-nine million, nine hundred twenty-one thousand, eight hundred seventy-four".