669947913 has 24 divisors (see below), whose sum is σ = 1023300096. Its totient is φ = 421675200.

The previous prime is 669947897. The next prime is 669947921. The reversal of 669947913 is 319749966.

669947913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 669947913 - 2⁴ = 669947897 is a prime.

It is a super-2 number, since 2×669947913² = 897660412266111138, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 669947913.

It is not an unprimeable number, because it can be changed into a prime (669947983) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17845 + ... + 40722.

It is an arithmetic number, because the mean of its divisors is an integer number (42637504).

Almost surely, 2^669947913 is an apocalyptic number.

It is an amenable number.

669947913 is a deficient number, since it is larger than the sum of its proper divisors (353352183).

669947913 is a wasteful number, since it uses less digits than its factorization.

669947913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58645 (or 58642 counting only the distinct ones).

The product of its digits is 2204496, while the sum is 54.

The square root of 669947913 is about 25883.3520433502. The cubic root of 669947913 is about 875.0113361252.

The spelling of 669947913 in words is "six hundred sixty-nine million, nine hundred forty-seven thousand, nine hundred thirteen".