669081591 has 24 divisors (see below), whose sum is σ = 1023044880. Its totient is φ = 420650496.

The previous prime is 669081577. The next prime is 669081607. The reversal of 669081591 is 195180966.

It is not a de Polignac number, because 669081591 - 2⁶ = 669081527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669081521) 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, 18586 + ... + 41031.

It is an arithmetic number, because the mean of its divisors is an integer number (42626870).

Almost surely, 2^669081591 is an apocalyptic number.

669081591 is a deficient number, since it is larger than the sum of its proper divisors (353963289).

669081591 is a wasteful number, since it uses less digits than its factorization.

669081591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59695 (or 59692 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 669081591 is about 25866.6115098209. The cubic root of 669081591 is about 874.6340090043.

The spelling of 669081591 in words is "six hundred sixty-nine million, eighty-one thousand, five hundred ninety-one".