665149226 has 48 divisors (see below), whose sum is σ = 1228217760. Its totient is φ = 268621920.

The previous prime is 665149211. The next prime is 665149231. The reversal of 665149226 is 622941566.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 392036 + ... + 393728.

It is an arithmetic number, because the mean of its divisors is an integer number (25587870).

Almost surely, 2^665149226 is an apocalyptic number.

665149226 is a deficient number, since it is larger than the sum of its proper divisors (563068534).

665149226 is a wasteful number, since it uses less digits than its factorization.

665149226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1939 (or 1932 counting only the distinct ones).

The product of its digits is 155520, while the sum is 41.

The square root of 665149226 is about 25790.4871221929. The cubic root of 665149226 is about 872.9171579557.

The spelling of 665149226 in words is "six hundred sixty-five million, one hundred forty-nine thousand, two hundred twenty-six".