669635955 has 24 divisors (see below), whose sum is σ = 1200728880. Its totient is φ = 344823360.

The previous prime is 669635951. The next prime is 669635963. The reversal of 669635955 is 559536966.

It is not a de Polignac number, because 669635955 - 2² = 669635951 is a prime.

It is not an unprimeable number, because it can be changed into a prime (669635951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 255261 + ... + 257870.

It is an arithmetic number, because the mean of its divisors is an integer number (50030370).

Almost surely, 2^669635955 is an apocalyptic number.

669635955 is a deficient number, since it is larger than the sum of its proper divisors (531092925).

669635955 is a wasteful number, since it uses less digits than its factorization.

669635955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513171 (or 513168 counting only the distinct ones).

The product of its digits is 6561000, while the sum is 54.

The square root of 669635955 is about 25877.3251129246. The cubic root of 669635955 is about 874.8755001094.

The spelling of 669635955 in words is "six hundred sixty-nine million, six hundred thirty-five thousand, nine hundred fifty-five".