669932961 has 4 divisors (see below), whose sum is σ = 893243952. Its totient is φ = 446621972.

The previous prime is 669932959. The next prime is 669932969. The reversal of 669932961 is 169239966.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 669932961 - 2¹ = 669932959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (669932969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111655491 + ... + 111655496.

It is an arithmetic number, because the mean of its divisors is an integer number (223310988).

Almost surely, 2^669932961 is an apocalyptic number.

It is an amenable number.

669932961 is a deficient number, since it is larger than the sum of its proper divisors (223310991).

669932961 is a wasteful number, since it uses less digits than its factorization.

669932961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223310990.

The product of its digits is 944784, while the sum is 51.

The square root of 669932961 is about 25883.0632074335. The cubic root of 669932961 is about 875.0048265312.

The spelling of 669932961 in words is "six hundred sixty-nine million, nine hundred thirty-two thousand, nine hundred sixty-one".