669712512 has 128 divisors (see below), whose sum is σ = 2061509760. Its totient is φ = 188669952.

The previous prime is 669712493. The next prime is 669712531. The reversal of 669712512 is 215217966.

It is an interprime number because it is at equal distance from previous prime (669712493) and next prime (669712531).

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194518 + ... + 197930.

It is an arithmetic number, because the mean of its divisors is an integer number (16105545).

Almost surely, 2^669712512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669712512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1030754880).

669712512 is an abundant number, since it is smaller than the sum of its proper divisors (1391797248).

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

669712512 is a wasteful number, since it uses less digits than its factorization.

669712512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3510 (or 3498 counting only the distinct ones).

The product of its digits is 45360, while the sum is 39.

The square root of 669712512 is about 25878.8043000445. The cubic root of 669712512 is about 874.9088392648.

The spelling of 669712512 in words is "six hundred sixty-nine million, seven hundred twelve thousand, five hundred twelve".