669397653 has 12 divisors (see below), whose sum is σ = 970956480. Its totient is φ = 444396456.

The previous prime is 669397639. The next prime is 669397697. The reversal of 669397653 is 356793966.

It is a happy number.

It is not a de Polignac number, because 669397653 - 2¹⁴ = 669381269 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 669397653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669397753) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 153451 + ... + 157752.

It is an arithmetic number, because the mean of its divisors is an integer number (80913040).

Almost surely, 2^669397653 is an apocalyptic number.

It is an amenable number.

669397653 is a deficient number, since it is larger than the sum of its proper divisors (301558827).

669397653 is a wasteful number, since it uses less digits than its factorization.

669397653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311448 (or 311445 counting only the distinct ones).

The product of its digits is 5511240, while the sum is 54.

The square root of 669397653 is about 25872.7202473957. The cubic root of 669397653 is about 874.7717077350.

The spelling of 669397653 in words is "six hundred sixty-nine million, three hundred ninety-seven thousand, six hundred fifty-three".