665025442 has 16 divisors (see below), whose sum is σ = 1010952000. Its totient is φ = 328071600.

The previous prime is 665025421. The next prime is 665025461. The reversal of 665025442 is 244520566.

It is a junction number, because it is equal to n+sod(n) for n = 665025398 and 665025407.

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 7 ways as a sum of consecutive naturals, for example, 37609 + ... + 52387.

It is an arithmetic number, because the mean of its divisors is an integer number (63184500).

Almost surely, 2^665025442 is an apocalyptic number.

665025442 is a deficient number, since it is larger than the sum of its proper divisors (345926558).

665025442 is a wasteful number, since it uses less digits than its factorization.

665025442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15081.

The product of its (nonzero) digits is 57600, while the sum is 34.

The square root of 665025442 is about 25788.0872109585. The cubic root of 665025442 is about 872.8630047538.

The spelling of 665025442 in words is "six hundred sixty-five million, twenty-five thousand, four hundred forty-two".