19846988985 has 16 divisors (see below), whose sum is σ = 31821488640. Its totient is φ = 10562958720.

The previous prime is 19846988983. The next prime is 19846989007. The reversal of 19846988985 is 58988964891.

It is not a de Polignac number, because 19846988985 - 2¹ = 19846988983 is a prime.

It is a super-2 number, since 2×19846988985² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19846988983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1373956 + ... + 1388325.

It is an arithmetic number, because the mean of its divisors is an integer number (1988843040).

Almost surely, 2^19846988985 is an apocalyptic number.

19846988985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19846988985 is a deficient number, since it is larger than the sum of its proper divisors (11974499655).

19846988985 is a wasteful number, since it uses less digits than its factorization.

19846988985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2762768.

The product of its digits is 358318080, while the sum is 75.

The spelling of 19846988985 in words is "nineteen billion, eight hundred forty-six million, nine hundred eighty-eight thousand, nine hundred eighty-five".