669521475 has 72 divisors (see below), whose sum is σ = 1407662880. Its totient is φ = 297768960.

The previous prime is 669521473. The next prime is 669521507. The reversal of 669521475 is 574125966.

It is not a de Polignac number, because 669521475 - 2¹ = 669521473 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 669521475.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669521473) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 52531 + ... + 64019.

Almost surely, 2^669521475 is an apocalyptic number.

669521475 is an abundant number, since it is smaller than the sum of its proper divisors (738141405).

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

669521475 is a wasteful number, since it uses less digits than its factorization.

669521475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11549 (or 11541 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 669521475 is about 25875.1130432313. The cubic root of 669521475 is about 874.8256414489.

The spelling of 669521475 in words is "six hundred sixty-nine million, five hundred twenty-one thousand, four hundred seventy-five".