19775212704 has 144 divisors (see below), whose sum is σ = 61128823392. Its totient is φ = 6027692544.

The previous prime is 19775212693. The next prime is 19775212727. The reversal of 19775212704 is 40721257791.

It is a tau number, because it is divible by the number of its divisors (144).

It is a self number, because there is not a number n which added to its sum of digits gives 19775212704.

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, 375927 + ... + 425289.

It is an arithmetic number, because the mean of its divisors is an integer number (424505718).

Almost surely, 2^19775212704 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19775212704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30564411696).

19775212704 is an abundant number, since it is smaller than the sum of its proper divisors (41353610688).

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

19775212704 is a wasteful number, since it uses less digits than its factorization.

19775212704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49499 (or 49488 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 45.

The spelling of 19775212704 in words is "nineteen billion, seven hundred seventy-five million, two hundred twelve thousand, seven hundred four".