1999525668 has 48 divisors (see below), whose sum is σ = 5504077824. Its totient is φ = 552863520.

The previous prime is 1999525657. The next prime is 1999525729. The reversal of 1999525668 is 8665259991.

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 15 ways as a sum of consecutive naturals, for example, 381330 + ... + 386537.

It is an arithmetic number, because the mean of its divisors is an integer number (114668288).

Almost surely, 2^1999525668 is an apocalyptic number.

It is an amenable number.

1999525668 is an abundant number, since it is smaller than the sum of its proper divisors (3504552156).

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

1999525668 is a wasteful number, since it uses less digits than its factorization.

1999525668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767912 (or 767910 counting only the distinct ones).

The product of its digits is 10497600, while the sum is 60.

The square root of 1999525668 is about 44716.0560425447. The cubic root of 1999525668 is about 1259.8214385411.

The spelling of 1999525668 in words is "one billion, nine hundred ninety-nine million, five hundred twenty-five thousand, six hundred sixty-eight".