669773881 has 8 divisors (see below), whose sum is σ = 765630144. Its totient is φ = 573961200.

The previous prime is 669773873. The next prime is 669773887. The reversal of 669773881 is 188377966.

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 669773881 - 2³ = 669773873 is a prime.

It is a super-2 number, since 2×669773881² = 897194103339604322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669773887) 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, 34866 + ... + 50548.

It is an arithmetic number, because the mean of its divisors is an integer number (95703768).

Almost surely, 2^669773881 is an apocalyptic number.

It is an amenable number.

669773881 is a deficient number, since it is larger than the sum of its proper divisors (95856263).

669773881 is a wasteful number, since it uses less digits than its factorization.

669773881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21791.

The product of its digits is 3048192, while the sum is 55.

The square root of 669773881 is about 25879.9899729501. The cubic root of 669773881 is about 874.9355624928.

The spelling of 669773881 in words is "six hundred sixty-nine million, seven hundred seventy-three thousand, eight hundred eighty-one".