19968545531 has 16 divisors (see below), whose sum is σ = 22119377280. Its totient is φ = 17873887680.

The previous prime is 19968545507. The next prime is 19968545533. The reversal of 19968545531 is 13554586991.

It is a de Polignac number, because none of the positive numbers 2^k-19968545531 is a prime.

It is a super-2 number, since 2×19968545531² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19968545533) 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, 1990055 + ... + 2000063.

It is an arithmetic number, because the mean of its divisors is an integer number (1382461080).

Almost surely, 2^19968545531 is an apocalyptic number.

19968545531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19968545531 is a deficient number, since it is larger than the sum of its proper divisors (2150831749).

19968545531 is a wasteful number, since it uses less digits than its factorization.

19968545531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12794.

The product of its digits is 5832000, while the sum is 56.

The spelling of 19968545531 in words is "nineteen billion, nine hundred sixty-eight million, five hundred forty-five thousand, five hundred thirty-one".