19965211560 has 128 divisors (see below), whose sum is σ = 76057977600. Its totient is φ = 4563475200.

The previous prime is 19965211549. The next prime is 19965211561. The reversal of 19965211560 is 6511256991.

It is a happy number.

19965211560 is a `hidden beast` number, since 1 + 9 + 9 + 65 + 21 + 1 + 560 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (19965211561) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1312891 + ... + 1328010.

It is an arithmetic number, because the mean of its divisors is an integer number (594202950).

Almost surely, 2^19965211560 is an apocalyptic number.

19965211560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19965211560 is an abundant number, since it is smaller than the sum of its proper divisors (56092766040).

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

19965211560 is a wasteful number, since it uses less digits than its factorization.

19965211560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2640928 (or 2640918 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 45.

The spelling of 19965211560 in words is "nineteen billion, nine hundred sixty-five million, two hundred eleven thousand, five hundred sixty".