669547769 has 4 divisors (see below), whose sum is σ = 730415760. Its totient is φ = 608679780.

The previous prime is 669547729. The next prime is 669547787. The reversal of 669547769 is 967745966.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 669547769 - 2⁸ = 669547513 is a prime.

It is a super-2 number, since 2×669547769² = 896588429945754722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669547729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30433979 + ... + 30434000.

It is an arithmetic number, because the mean of its divisors is an integer number (182603940).

Almost surely, 2^669547769 is an apocalyptic number.

It is an amenable number.

669547769 is a deficient number, since it is larger than the sum of its proper divisors (60867991).

669547769 is a wasteful number, since it uses less digits than its factorization.

669547769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60867990.

The product of its digits is 17146080, while the sum is 59.

The square root of 669547769 is about 25875.6211326414. The cubic root of 669547769 is about 874.8370935905.

The spelling of 669547769 in words is "six hundred sixty-nine million, five hundred forty-seven thousand, seven hundred sixty-nine".