669001374720 has 792 divisors, whose sum is σ = 2718930599424. Its totient is φ = 151645519872.

The previous prime is 669001374661. The next prime is 669001374773. The reversal of 669001374720 is 27473100966.

669001374720 is a `hidden beast` number, since 66 + 90 + 0 + 1 + 37 + 472 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 286754674 + ... + 286757006.

Almost surely, 2^669001374720 is an apocalyptic number.

669001374720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669001374720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1359465299712).

669001374720 is an abundant number, since it is smaller than the sum of its proper divisors (2049929224704).

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

669001374720 is a wasteful number, since it uses less digits than its factorization.

669001374720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2505 (or 2477 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 45.

The spelling of 669001374720 in words is "six hundred sixty-nine billion, one million, three hundred seventy-four thousand, seven hundred twenty".