19144312640 has 28 divisors (see below), whose sum is σ = 45587395236. Its totient is φ = 7657724928.

The previous prime is 19144312489. The next prime is 19144312669. The reversal of 19144312640 is 4621344191.

It can be written as a sum of positive squares in 2 ways, for example, as 9837465856 + 9306846784 = 99184^2 + 96472^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19144312640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29912669 + ... + 29913308.

Almost surely, 2^19144312640 is an apocalyptic number.

19144312640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19144312640 is an abundant number, since it is smaller than the sum of its proper divisors (26443082596).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19144312640 is an equidigital number, since it uses as much as digits as its factorization.

19144312640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59825994 (or 59825984 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The spelling of 19144312640 in words is "nineteen billion, one hundred forty-four million, three hundred twelve thousand, six hundred forty".