19818964893 has 32 divisors (see below), whose sum is σ = 32540610816. Its totient is φ = 10448437248.

The previous prime is 19818964889. The next prime is 19818964901. The reversal of 19818964893 is 39846981891.

It is not a de Polignac number, because 19818964893 - 2² = 19818964889 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19818964813) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 527005 + ... + 563357.

It is an arithmetic number, because the mean of its divisors is an integer number (1016894088).

Almost surely, 2^19818964893 is an apocalyptic number.

19818964893 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

19818964893 is a deficient number, since it is larger than the sum of its proper divisors (12721645923).

19818964893 is a wasteful number, since it uses less digits than its factorization.

19818964893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38373.

The product of its digits is 26873856, while the sum is 66.

The spelling of 19818964893 in words is "nineteen billion, eight hundred eighteen million, nine hundred sixty-four thousand, eight hundred ninety-three".