665441426 has 16 divisors (see below), whose sum is σ = 1099944384. Its totient is φ = 299983824.

The previous prime is 665441417. The next prime is 665441431. The reversal of 665441426 is 624144566.

665441426 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 665441426.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 296486 + ... + 298721.

It is an arithmetic number, because the mean of its divisors is an integer number (68746524).

Almost surely, 2^665441426 is an apocalyptic number.

665441426 is a deficient number, since it is larger than the sum of its proper divisors (434502958).

665441426 is a wasteful number, since it uses less digits than its factorization.

665441426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595265.

The product of its digits is 138240, while the sum is 38.

The square root of 665441426 is about 25796.1513796148. The cubic root of 665441426 is about 873.0449633877.

The spelling of 665441426 in words is "six hundred sixty-five million, four hundred forty-one thousand, four hundred twenty-six".