669491012 has 6 divisors (see below), whose sum is σ = 1171609278. Its totient is φ = 334745504.

The previous prime is 669490999. The next prime is 669491023. The reversal of 669491012 is 210194966.

It can be written as a sum of positive squares in only one way, i.e., 651985156 + 17505856 = 25534^2 + 4184^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83686373 + ... + 83686380.

It is an arithmetic number, because the mean of its divisors is an integer number (195268213).

Almost surely, 2^669491012 is an apocalyptic number.

It is an amenable number.

669491012 is a deficient number, since it is larger than the sum of its proper divisors (502118266).

669491012 is a wasteful number, since it uses less digits than its factorization.

669491012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167372757 (or 167372755 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 669491012 is about 25874.5243821022. The cubic root of 669491012 is about 874.8123731577.

The spelling of 669491012 in words is "six hundred sixty-nine million, four hundred ninety-one thousand, twelve".