19992827985 has 128 divisors (see below), whose sum is σ = 37848674304. Its totient is φ = 8918138880.

The previous prime is 19992827971. The next prime is 19992827999. The reversal of 19992827985 is 58972829991.

It is an interprime number because it is at equal distance from previous prime (19992827971) and next prime (19992827999).

It is not a de Polignac number, because 19992827985 - 2⁷ = 19992827857 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 26410227 + ... + 26410983.

It is an arithmetic number, because the mean of its divisors is an integer number (295692768).

Almost surely, 2^19992827985 is an apocalyptic number.

19992827985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19992827985 is a deficient number, since it is larger than the sum of its proper divisors (17855846319).

19992827985 is a wasteful number, since it uses less digits than its factorization.

19992827985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083.

The product of its digits is 58786560, while the sum is 69.

The spelling of 19992827985 in words is "nineteen billion, nine hundred ninety-two million, eight hundred twenty-seven thousand, nine hundred eighty-five".