669437289 has 6 divisors (see below), whose sum is σ = 966964986. Its totient is φ = 446291520.

The previous prime is 669437269. The next prime is 669437371. The reversal of 669437289 is 982734966.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 632019600 + 37417689 = 25140^2 + 6117^2 .

It is not a de Polignac number, because 669437289 - 2²¹ = 667340137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (669437269) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37190952 + ... + 37190969.

It is an arithmetic number, because the mean of its divisors is an integer number (161160831).

Almost surely, 2^669437289 is an apocalyptic number.

It is an amenable number.

669437289 is a deficient number, since it is larger than the sum of its proper divisors (297527697).

669437289 is a wasteful number, since it uses less digits than its factorization.

669437289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74381927 (or 74381924 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The square root of 669437289 is about 25873.4862165886. The cubic root of 669437289 is about 874.7889728922.

The spelling of 669437289 in words is "six hundred sixty-nine million, four hundred thirty-seven thousand, two hundred eighty-nine".