669147756 has 12 divisors (see below), whose sum is σ = 1561344792. Its totient is φ = 223049248.

The previous prime is 669147751. The next prime is 669147767. The reversal of 669147756 is 657741966.

It is a happy number.

669147756 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 669147699 and 669147708.

It is not an unprimeable number, because it can be changed into a prime (669147751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27881145 + ... + 27881168.

It is an arithmetic number, because the mean of its divisors is an integer number (130112066).

Almost surely, 2^669147756 is an apocalyptic number.

It is an amenable number.

669147756 is an abundant number, since it is smaller than the sum of its proper divisors (892197036).

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

669147756 is a wasteful number, since it uses less digits than its factorization.

669147756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55762320 (or 55762318 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 51.

The square root of 669147756 is about 25867.8904435596. The cubic root of 669147756 is about 874.6628386979.

It can be divided in two parts, 669147 and 756, that added together give a triangular number (669903 = T₁₁₅₇).

The spelling of 669147756 in words is "six hundred sixty-nine million, one hundred forty-seven thousand, seven hundred fifty-six".