19976561472 has 112 divisors (see below), whose sum is σ = 61638281600. Its totient is φ = 5707570176.

The previous prime is 19976561453. The next prime is 19976561489. The reversal of 19976561472 is 27416567991.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is an unprimeable number.

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, 85813 + ... + 217524.

It is an arithmetic number, because the mean of its divisors is an integer number (550341800).

Almost surely, 2^19976561472 is an apocalyptic number.

19976561472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19976561472 is an abundant number, since it is smaller than the sum of its proper divisors (41661720128).

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

19976561472 is an equidigital number, since it uses as much as digits as its factorization.

19976561472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303373 (or 303349 counting only the distinct ones).

The product of its digits is 5715360, while the sum is 57.

The spelling of 19976561472 in words is "nineteen billion, nine hundred seventy-six million, five hundred sixty-one thousand, four hundred seventy-two".