19655572530 has 128 divisors (see below), whose sum is σ = 55151456256. Its totient is φ = 4434566400.

The previous prime is 19655572459. The next prime is 19655572543. The reversal of 19655572530 is 3527555691.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 19655572530.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 245835 + ... + 315825.

It is an arithmetic number, because the mean of its divisors is an integer number (430870752).

Almost surely, 2^19655572530 is an apocalyptic number.

19655572530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19655572530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27575728128).

19655572530 is an abundant number, since it is smaller than the sum of its proper divisors (35495883726).

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

19655572530 is a wasteful number, since it uses less digits than its factorization.

19655572530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70072.

The product of its (nonzero) digits is 1417500, while the sum is 48.

The spelling of 19655572530 in words is "nineteen billion, six hundred fifty-five million, five hundred seventy-two thousand, five hundred thirty".