669865627 has 4 divisors (see below), whose sum is σ = 670901616. Its totient is φ = 668829640.

The previous prime is 669865597. The next prime is 669865631. The reversal of 669865627 is 726568966.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 669865627 - 2²⁷ = 535647899 is a prime.

It is a super-2 number, since 2×669865627² = 897439916472206258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669865687) 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, 517024 + ... + 518317.

It is an arithmetic number, because the mean of its divisors is an integer number (167725404).

Almost surely, 2^669865627 is an apocalyptic number.

669865627 is a deficient number, since it is larger than the sum of its proper divisors (1035989).

669865627 is a wasteful number, since it uses less digits than its factorization.

669865627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035988.

The product of its digits is 6531840, while the sum is 55.

The square root of 669865627 is about 25881.7624399885. The cubic root of 669865627 is about 874.9755103894.

The spelling of 669865627 in words is "six hundred sixty-nine million, eight hundred sixty-five thousand, six hundred twenty-seven".