665631022 has 32 divisors (see below), whose sum is σ = 1210180608. Its totient is φ = 268050816.

The previous prime is 665630993. The next prime is 665631067. The reversal of 665631022 is 220136566.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 171103 + ... + 174949.

It is an arithmetic number, because the mean of its divisors is an integer number (37818144).

Almost surely, 2^665631022 is an apocalyptic number.

665631022 is a deficient number, since it is larger than the sum of its proper divisors (544549586).

665631022 is a wasteful number, since it uses less digits than its factorization.

665631022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4600.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 665631022 is about 25799.8260071652. The cubic root of 665631022 is about 873.1278708175.

Adding to 665631022 its reverse (220136566), we get a palindrome (885767588).

The spelling of 665631022 in words is "six hundred sixty-five million, six hundred thirty-one thousand, twenty-two".