997665444 has 24 divisors (see below), whose sum is σ = 2586540320. Its totient is φ = 332555112.

The previous prime is 997665419. The next prime is 997665499. The reversal of 997665444 is 444566799.

It is a happy number.

997665444 is a `hidden beast` number, since 9 + 97 + 6 + 6 + 544 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nialpdrome in base 10.

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, 4618714 + ... + 4618929.

Almost surely, 2^997665444 is an apocalyptic number.

It is an amenable number.

997665444 is an abundant number, since it is smaller than the sum of its proper divisors (1588874876).

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

997665444 is a wasteful number, since it uses less digits than its factorization.

997665444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9237656 (or 9237648 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 54.

The square root of 997665444 is about 31585.8424614573. The cubic root of 997665444 is about 999.2212083076.

The spelling of 997665444 in words is "nine hundred ninety-seven million, six hundred sixty-five thousand, four hundred forty-four".