19051312640 has 80 divisors (see below), whose sum is σ = 45827290080. Its totient is φ = 7595704320.

The previous prime is 19051312639. The next prime is 19051312649. The reversal of 19051312640 is 4621315091.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 19051312597 and 19051312606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19051312649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 784196 + ... + 808124.

It is an arithmetic number, because the mean of its divisors is an integer number (572841126).

Almost surely, 2^19051312640 is an apocalyptic number.

19051312640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19051312640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22913645040).

19051312640 is an abundant number, since it is smaller than the sum of its proper divisors (26775977440).

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

19051312640 is an equidigital number, since it uses as much as digits as its factorization.

19051312640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24263 (or 24247 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The spelling of 19051312640 in words is "nineteen billion, fifty-one million, three hundred twelve thousand, six hundred forty".