669276891 has 16 divisors (see below), whose sum is σ = 1003470720. Its totient is φ = 440807400.

The previous prime is 669276833. The next prime is 669276901. The reversal of 669276891 is 198672966.

It is not a de Polignac number, because 669276891 - 2²⁵ = 635722459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (669276821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147085 + ... + 151566.

It is an arithmetic number, because the mean of its divisors is an integer number (62716920).

Almost surely, 2^669276891 is an apocalyptic number.

669276891 is a deficient number, since it is larger than the sum of its proper divisors (334193829).

669276891 is a wasteful number, since it uses less digits than its factorization.

669276891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298743 (or 298737 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The square root of 669276891 is about 25870.3863712933. The cubic root of 669276891 is about 874.7191004725.

The spelling of 669276891 in words is "six hundred sixty-nine million, two hundred seventy-six thousand, eight hundred ninety-one".