1219997786944 has 112 divisors (see below), whose sum is σ = 2500582613760. Its totient is φ = 590186741760.

The previous prime is 1219997786933. The next prime is 1219997787007. The reversal of 1219997786944 is 4496877999121.

Its product of digits (493807104) is a multiple of the sum of its prime factors (3888).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 577376032 + ... + 577378144.

It is an arithmetic number, because the mean of its divisors is an integer number (22326630480).

Almost surely, 2^{1219997786944} 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 1219997786944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1250291306880).

1219997786944 is an abundant number, since it is smaller than the sum of its proper divisors (1280584826816).

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

1219997786944 is a wasteful number, since it uses less digits than its factorization.

1219997786944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3888 (or 3878 counting only the distinct ones).

The product of its digits is 493807104, while the sum is 76.

The spelling of 1219997786944 in words is "one trillion, two hundred nineteen billion, nine hundred ninety-seven million, seven hundred eighty-six thousand, nine hundred forty-four".