669545898 has 24 divisors (see below), whose sum is σ = 1557719712. Its totient is φ = 191298744.

The previous prime is 669545837. The next prime is 669545911. The reversal of 669545898 is 898545966.

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 11 ways as a sum of consecutive naturals, for example, 1138390 + ... + 1138977.

It is an arithmetic number, because the mean of its divisors is an integer number (64904988).

Almost surely, 2^669545898 is an apocalyptic number.

669545898 is an abundant number, since it is smaller than the sum of its proper divisors (888173814).

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

669545898 is a wasteful number, since it uses less digits than its factorization.

669545898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2277386 (or 2277379 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 60.

The square root of 669545898 is about 25875.5849788947. The cubic root of 669545898 is about 874.8362787013.

The spelling of 669545898 in words is "six hundred sixty-nine million, five hundred forty-five thousand, eight hundred ninety-eight".