669990952 has 8 divisors (see below), whose sum is σ = 1256233050. Its totient is φ = 334995472.

The previous prime is 669990947. The next prime is 669990953. The reversal of 669990952 is 259099966.

It can be written as a sum of positive squares in only one way, i.e., 669463876 + 527076 = 25874^2 + 726^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 669990893 and 669990902.

It is not an unprimeable number, because it can be changed into a prime (669990953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41874427 + ... + 41874442.

Almost surely, 2^669990952 is an apocalyptic number.

It is an amenable number.

669990952 is a deficient number, since it is larger than the sum of its proper divisors (586242098).

669990952 is a wasteful number, since it uses less digits than its factorization.

669990952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83748875 (or 83748871 counting only the distinct ones).

The product of its (nonzero) digits is 2361960, while the sum is 55.

The square root of 669990952 is about 25884.1834331315. The cubic root of 669990952 is about 875.0300733065.

The spelling of 669990952 in words is "six hundred sixty-nine million, nine hundred ninety thousand, nine hundred fifty-two".