19155977984 has 144 divisors (see below), whose sum is σ = 46877128704. Its totient is φ = 7687680000.

The previous prime is 19155977983. The next prime is 19155978001. The reversal of 19155977984 is 48977955191.

It is a self number, because there is not a number n which added to its sum of digits gives 19155977984.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19155977983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 830609 + ... + 853359.

It is an arithmetic number, because the mean of its divisors is an integer number (325535616).

Almost surely, 2^19155977984 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 19155977984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23438564352).

19155977984 is an abundant number, since it is smaller than the sum of its proper divisors (27721150720).

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

19155977984 is a wasteful number, since it uses less digits than its factorization.

19155977984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22814 (or 22800 counting only the distinct ones).

The product of its digits is 28576800, while the sum is 65.

The spelling of 19155977984 in words is "nineteen billion, one hundred fifty-five million, nine hundred seventy-seven thousand, nine hundred eighty-four".