19781086143 has 96 divisors (see below), whose sum is σ = 35469557760. Its totient is φ = 9564946560.

The previous prime is 19781086141. The next prime is 19781086147. The reversal of 19781086143 is 34168018791.

It is not a de Polignac number, because 19781086143 - 2¹ = 19781086141 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19781086092 and 19781086101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19781086141) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2085630 + ... + 2095092.

It is an arithmetic number, because the mean of its divisors is an integer number (369474560).

Almost surely, 2^19781086143 is an apocalyptic number.

19781086143 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

19781086143 is a deficient number, since it is larger than the sum of its proper divisors (15688471617).

19781086143 is a wasteful number, since it uses less digits than its factorization.

19781086143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9549 (or 9536 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 48.

The spelling of 19781086143 in words is "nineteen billion, seven hundred eighty-one million, eighty-six thousand, one hundred forty-three".