19615645560 has 512 divisors, whose sum is σ = 72201093120. Its totient is φ = 4169318400.

The previous prime is 19615645547. The next prime is 19615645561. The reversal of 19615645560 is 6554651691.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19615645561) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 84187204 + ... + 84187436.

It is an arithmetic number, because the mean of its divisors is an integer number (141017760).

Almost surely, 2^19615645560 is an apocalyptic number.

19615645560 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 19615645560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36100546560).

19615645560 is an abundant number, since it is smaller than the sum of its proper divisors (52585447560).

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

19615645560 is a wasteful number, since it uses less digits than its factorization.

19615645560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399 (or 395 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 19615645560 in words is "nineteen billion, six hundred fifteen million, six hundred forty-five thousand, five hundred sixty".