669944735280 has 120 divisors (see below), whose sum is σ = 2382244705152. Its totient is φ = 168142989312.

The previous prime is 669944735227. The next prime is 669944735321. The reversal of 669944735280 is 82537449966.

669944735280 is a `hidden beast` number, since 6 + 69 + 9 + 4 + 47 + 3 + 528 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27354784 + ... + 27379263.

Almost surely, 2^669944735280 is an apocalyptic number.

669944735280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

669944735280 is an abundant number, since it is smaller than the sum of its proper divisors (1712299969872).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669944735280 is a wasteful number, since it uses less digits than its factorization.

669944735280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54734083 (or 54734074 counting only the distinct ones).

The product of its (nonzero) digits is 78382080, while the sum is 63.

The spelling of 669944735280 in words is "six hundred sixty-nine billion, nine hundred forty-four million, seven hundred thirty-five thousand, two hundred eighty".