669676591 has 8 divisors (see below), whose sum is σ = 683100800. Its totient is φ = 656353368.

The previous prime is 669676577. The next prime is 669676639. The reversal of 669676591 is 195676966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 669676591 - 2⁹ = 669676079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669676541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11781 + ... + 38446.

It is an arithmetic number, because the mean of its divisors is an integer number (85387600).

Almost surely, 2^669676591 is an apocalyptic number.

669676591 is a deficient number, since it is larger than the sum of its proper divisors (13424209).

669676591 is a wasteful number, since it uses less digits than its factorization.

669676591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50493.

The product of its digits is 3674160, while the sum is 55.

The square root of 669676591 is about 25878.1102671737. The cubic root of 669676591 is about 874.8931966511.

The spelling of 669676591 in words is "six hundred sixty-nine million, six hundred seventy-six thousand, five hundred ninety-one".