669956140 has 24 divisors (see below), whose sum is σ = 1607895072. Its totient is φ = 229699200.

The previous prime is 669956137. The next prime is 669956143. The reversal of 669956140 is 41659966.

It is an interprime number because it is at equal distance from previous prime (669956137) and next prime (669956143).

It is not an unprimeable number, because it can be changed into a prime (669956143) by changing a digit.

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, 2392561 + ... + 2392840.

It is an arithmetic number, because the mean of its divisors is an integer number (66995628).

Almost surely, 2^669956140 is an apocalyptic number.

It is an amenable number.

669956140 is an abundant number, since it is smaller than the sum of its proper divisors (937938932).

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

669956140 is a wasteful number, since it uses less digits than its factorization.

669956140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4785417 (or 4785415 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 46.

The square root of 669956140 is about 25883.5109674093. The cubic root of 669956140 is about 875.0149178409.

The spelling of 669956140 in words is "six hundred sixty-nine million, nine hundred fifty-six thousand, one hundred forty".