665772144 has 20 divisors (see below), whose sum is σ = 1719911496. Its totient is φ = 221924032.

The previous prime is 665772127. The next prime is 665772161. The reversal of 665772144 is 441277566.

665772144 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (665772127) and next prime (665772161).

It is a junction number, because it is equal to n+sod(n) for n = 665772096 and 665772105.

It is a congruent number.

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, 6935079 + ... + 6935174.

Almost surely, 2^665772144 is an apocalyptic number.

It is an amenable number.

665772144 is an abundant number, since it is smaller than the sum of its proper divisors (1054139352).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665772144 is a wasteful number, since it uses less digits than its factorization.

665772144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13870264 (or 13870258 counting only the distinct ones).

The product of its digits is 282240, while the sum is 42.

The square root of 665772144 is about 25802.5608031451. The cubic root of 665772144 is about 873.1895710891.

The spelling of 665772144 in words is "six hundred sixty-five million, seven hundred seventy-two thousand, one hundred forty-four".