669955998 has 16 divisors (see below), whose sum is σ = 1410433920. Its totient is φ = 211565016.

The previous prime is 669955991. The next prime is 669956051. The reversal of 669955998 is 899559966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669955991) 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, 2938290 + ... + 2938517.

It is an arithmetic number, because the mean of its divisors is an integer number (88152120).

Almost surely, 2^669955998 is an apocalyptic number.

669955998 is an abundant number, since it is smaller than the sum of its proper divisors (740477922).

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

669955998 is a wasteful number, since it uses less digits than its factorization.

669955998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5876831.

The product of its digits is 47239200, while the sum is 66.

The square root of 669955998 is about 25883.5082243501. The cubic root of 669955998 is about 875.0148560199.

The spelling of 669955998 in words is "six hundred sixty-nine million, nine hundred fifty-five thousand, nine hundred ninety-eight".