669444542 has 16 divisors (see below), whose sum is σ = 1082011392. Its totient is φ = 308802720.

The previous prime is 669444539. The next prime is 669444563. The reversal of 669444542 is 245444966.

It is a junction number, because it is equal to n+sod(n) for n = 669444493 and 669444502.

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, 48788 + ... + 60984.

It is an arithmetic number, because the mean of its divisors is an integer number (67625712).

Almost surely, 2^669444542 is an apocalyptic number.

669444542 is a deficient number, since it is larger than the sum of its proper divisors (412566850).

669444542 is a wasteful number, since it uses less digits than its factorization.

669444542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14323.

The product of its digits is 829440, while the sum is 44.

The square root of 669444542 is about 25873.6263789984. The cubic root of 669444542 is about 874.7921321732.

The spelling of 669444542 in words is "six hundred sixty-nine million, four hundred forty-four thousand, five hundred forty-two".