999165572 has 48 divisors (see below), whose sum is σ = 1829677248. Its totient is φ = 477050880.

The previous prime is 999165553. The next prime is 999165581. The reversal of 999165572 is 275561999.

It is a happy number.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1701863 + ... + 1702449.

It is an arithmetic number, because the mean of its divisors is an integer number (38118276).

Almost surely, 2^999165572 is an apocalyptic number.

It is an amenable number.

999165572 is a deficient number, since it is larger than the sum of its proper divisors (830511676).

999165572 is a wasteful number, since it uses less digits than its factorization.

999165572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836 (or 834 counting only the distinct ones).

The product of its digits is 1530900, while the sum is 53.

The square root of 999165572 is about 31609.5803831686. The cubic root of 999165572 is about 999.7217799341.

The spelling of 999165572 in words is "nine hundred ninety-nine million, one hundred sixty-five thousand, five hundred seventy-two".