669851670 has 32 divisors (see below), whose sum is σ = 1608325632. Its totient is φ = 178551392.

The previous prime is 669851659. The next prime is 669851671. The reversal of 669851670 is 76158966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669851671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131389 + ... + 136391.

It is an arithmetic number, because the mean of its divisors is an integer number (50260176).

Almost surely, 2^669851670 is an apocalyptic number.

669851670 is an abundant number, since it is smaller than the sum of its proper divisors (938473962).

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

669851670 is a wasteful number, since it uses less digits than its factorization.

669851670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9476.

The product of its (nonzero) digits is 544320, while the sum is 48.

The square root of 669851670 is about 25881.4928085688. The cubic root of 669851670 is about 874.9694334901.

The spelling of 669851670 in words is "six hundred sixty-nine million, eight hundred fifty-one thousand, six hundred seventy".