669218542 has 16 divisors (see below), whose sum is σ = 1021289472. Its totient is φ = 328831480.

The previous prime is 669218531. The next prime is 669218567. The reversal of 669218542 is 245812966.

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, 21153 + ... + 42259.

It is an arithmetic number, because the mean of its divisors is an integer number (63830592).

Almost surely, 2^669218542 is an apocalyptic number.

669218542 is a deficient number, since it is larger than the sum of its proper divisors (352070930).

669218542 is a wasteful number, since it uses less digits than its factorization.

669218542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21383.

The product of its digits is 207360, while the sum is 43.

The square root of 669218542 is about 25869.2586287277. The cubic root of 669218542 is about 874.6936797690.

The spelling of 669218542 in words is "six hundred sixty-nine million, two hundred eighteen thousand, five hundred forty-two".