669781833604 has 27 divisors (see below), whose sum is σ = 1269257081967. Its totient is φ = 309120256224.

The previous prime is 669781833593. The next prime is 669781833641. The reversal of 669781833604 is 406338187966.

The square root of 669781833604 is 818402.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 32977833604 + 636804000000 = 181598^2 + 798000^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 21262714 + ... + 21294190.

Almost surely, 2^669781833604 is an apocalyptic number.

669781833604 is the 818402-nd square number.

It is an amenable number.

669781833604 is a deficient number, since it is larger than the sum of its proper divisors (599475248363).

669781833604 is an frugal number, since it uses more digits than its factorization.

669781833604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62984 (or 31492 counting only the distinct ones).

The product of its (nonzero) digits is 31352832, while the sum is 61.

The spelling of 669781833604 in words is "six hundred sixty-nine billion, seven hundred eighty-one million, eight hundred thirty-three thousand, six hundred four".