669903642 has 16 divisors (see below), whose sum is σ = 1488674880. Its totient is φ = 223301196.

The previous prime is 669903617. The next prime is 669903667. The reversal of 669903642 is 246309966.

It is an interprime number because it is at equal distance from previous prime (669903617) and next prime (669903667).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 6202758 + ... + 6202865.

It is an arithmetic number, because the mean of its divisors is an integer number (93042180).

Almost surely, 2^669903642 is an apocalyptic number.

669903642 is an abundant number, since it is smaller than the sum of its proper divisors (818771238).

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

669903642 is a wasteful number, since it uses less digits than its factorization.

669903642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12405634 (or 12405628 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 45.

The square root of 669903642 is about 25882.4968270065. The cubic root of 669903642 is about 874.9920617511.

The spelling of 669903642 in words is "six hundred sixty-nine million, nine hundred three thousand, six hundred forty-two".