19538610489 has 12 divisors (see below), whose sum is σ = 28501868772. Its totient is φ = 12896772000.

The previous prime is 19538610473. The next prime is 19538610491. The reversal of 19538610489 is 98401683591.

19538610489 is a `hidden beast` number, since 1 + 9 + 538 + 61 + 0 + 48 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12092301225 + 7446309264 = 109965^2 + 86292^2 .

It is not a de Polignac number, because 19538610489 - 2⁴ = 19538610473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19538610419) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10746402 + ... + 10748219.

It is an arithmetic number, because the mean of its divisors is an integer number (2375155731).

Almost surely, 2^19538610489 is an apocalyptic number.

It is an amenable number.

19538610489 is a deficient number, since it is larger than the sum of its proper divisors (8963258283).

19538610489 is a wasteful number, since it uses less digits than its factorization.

19538610489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21494728 (or 21494725 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The spelling of 19538610489 in words is "nineteen billion, five hundred thirty-eight million, six hundred ten thousand, four hundred eighty-nine".