669812156 has 24 divisors (see below), whose sum is σ = 1263052224. Its totient is φ = 308969280.

The previous prime is 669812089. The next prime is 669812167. The reversal of 669812156 is 651218966.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155066 + ... + 159326.

It is an arithmetic number, because the mean of its divisors is an integer number (52627176).

Almost surely, 2^669812156 is an apocalyptic number.

It is an amenable number.

669812156 is a deficient number, since it is larger than the sum of its proper divisors (593240068).

669812156 is a wasteful number, since it uses less digits than its factorization.

669812156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7301 (or 7299 counting only the distinct ones).

The product of its digits is 155520, while the sum is 44.

The square root of 669812156 is about 25880.7294333062. The cubic root of 669812156 is about 874.9522285756.

The spelling of 669812156 in words is "six hundred sixty-nine million, eight hundred twelve thousand, one hundred fifty-six".