669994533 has 18 divisors (see below), whose sum is σ = 1042649426. Its totient is φ = 412132032.

The previous prime is 669994519. The next prime is 669994547. The reversal of 669994533 is 335499966.

It is an interprime number because it is at equal distance from previous prime (669994519) and next prime (669994547).

It can be written as a sum of positive squares in 3 ways, for example, as 123276609 + 546717924 = 11103^2 + 23382^2 .

It is not a de Polignac number, because 669994533 - 2¹⁶ = 669928997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 669994533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669994133) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 278785 + ... + 281177.

Almost surely, 2^669994533 is an apocalyptic number.

It is an amenable number.

669994533 is a deficient number, since it is larger than the sum of its proper divisors (372654893).

669994533 is an equidigital number, since it uses as much as digits as its factorization.

669994533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4805 (or 2409 counting only the distinct ones).

The product of its digits is 4723920, while the sum is 54.

The square root of 669994533 is about 25884.2526065560. The cubic root of 669994533 is about 875.0316322714.

The spelling of 669994533 in words is "six hundred sixty-nine million, nine hundred ninety-four thousand, five hundred thirty-three".