665640074444 has 12 divisors (see below), whose sum is σ = 1164879544584. Its totient is φ = 332817347424.

The previous prime is 665640074431. The next prime is 665640074467. The reversal of 665640074444 is 444470046566.

It is a happy number.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 665640074392 and 665640074401.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52049 + ... + 1154984.

It is an arithmetic number, because the mean of its divisors is an integer number (97073295382).

Almost surely, 2^665640074444 is an apocalyptic number.

It is an amenable number.

665640074444 is a deficient number, since it is larger than the sum of its proper divisors (499239470140).

665640074444 is a wasteful number, since it uses less digits than its factorization.

665640074444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1344904 (or 1344902 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 50.

The spelling of 665640074444 in words is "six hundred sixty-five billion, six hundred forty million, seventy-four thousand, four hundred forty-four".