669487942 has 4 divisors (see below), whose sum is σ = 1004231916. Its totient is φ = 334743970.

The previous prime is 669487937. The next prime is 669487943. The reversal of 669487942 is 249784966.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669487943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167371984 + ... + 167371987.

It is an arithmetic number, because the mean of its divisors is an integer number (251057979).

Almost surely, 2^669487942 is an apocalyptic number.

669487942 is a deficient number, since it is larger than the sum of its proper divisors (334743974).

669487942 is a wasteful number, since it uses less digits than its factorization.

669487942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334743973.

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

The square root of 669487942 is about 25874.4650572722. The cubic root of 669487942 is about 874.8110359836.

The spelling of 669487942 in words is "six hundred sixty-nine million, four hundred eighty-seven thousand, nine hundred forty-two".