19655448660 has 72 divisors (see below), whose sum is σ = 61829747616. Its totient is φ = 5241451680.

The previous prime is 19655448641. The next prime is 19655448707. The reversal of 19655448660 is 6684455691.

19655448660 is a `hidden beast` number, since 1 + 9 + 6 + 554 + 4 + 86 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 19655448597 and 19655448606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2017306 + ... + 2027025.

Almost surely, 2^19655448660 is an apocalyptic number.

19655448660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19655448660 is an abundant number, since it is smaller than the sum of its proper divisors (42174298956).

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

19655448660 is a wasteful number, since it uses less digits than its factorization.

19655448660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4044355 (or 4044341 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 54.

The spelling of 19655448660 in words is "nineteen billion, six hundred fifty-five million, four hundred forty-eight thousand, six hundred sixty".