669877641 has 16 divisors (see below), whose sum is σ = 1026633600. Its totient is φ = 431185104.

The previous prime is 669877631. The next prime is 669877643. The reversal of 669877641 is 146778966.

It is a happy number.

It is not a de Polignac number, because 669877641 - 2⁵ = 669877609 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (669877643) 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, 426981 + ... + 428546.

It is an arithmetic number, because the mean of its divisors is an integer number (64164600).

Almost surely, 2^669877641 is an apocalyptic number.

It is an amenable number.

669877641 is a deficient number, since it is larger than the sum of its proper divisors (356755959).

669877641 is a wasteful number, since it uses less digits than its factorization.

669877641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855565 (or 855559 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The square root of 669877641 is about 25881.9945328794. The cubic root of 669877641 is about 874.9807412360.

The spelling of 669877641 in words is "six hundred sixty-nine million, eight hundred seventy-seven thousand, six hundred forty-one".