669784942 has 16 divisors (see below), whose sum is σ = 1028915712. Its totient is φ = 326826360.

The previous prime is 669784939. The next prime is 669784981. The reversal of 669784942 is 249487966.

It is a happy number.

It is a super-2 number, since 2×669784942² = 897223737059886728, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129123 + ... + 134209.

It is an arithmetic number, because the mean of its divisors is an integer number (64307232).

Almost surely, 2^669784942 is an apocalyptic number.

669784942 is a deficient number, since it is larger than the sum of its proper divisors (359130770).

669784942 is a wasteful number, since it uses less digits than its factorization.

669784942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6663.

The product of its digits is 5225472, while the sum is 55.

The square root of 669784942 is about 25880.2036699868. The cubic root of 669784942 is about 874.9403788492.

The spelling of 669784942 in words is "six hundred sixty-nine million, seven hundred eighty-four thousand, nine hundred forty-two".