80919853721 has 16 divisors (see below), whose sum is σ = 93127822080. Its totient is φ = 68874235200.

The previous prime is 80919853699. The next prime is 80919853723. The reversal of 80919853721 is 12735891908.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 80919853721 - 2¹⁰ = 80919852697 is a prime.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80919853723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3061655 + ... + 3087971.

It is an arithmetic number, because the mean of its divisors is an integer number (5820488880).

Almost surely, 2^80919853721 is an apocalyptic number.

It is an amenable number.

80919853721 is a deficient number, since it is larger than the sum of its proper divisors (12207968359).

80919853721 is a wasteful number, since it uses less digits than its factorization.

80919853721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29384.

The product of its (nonzero) digits is 1088640, while the sum is 53.

The spelling of 80919853721 in words is "eighty billion, nine hundred nineteen million, eight hundred fifty-three thousand, seven hundred twenty-one".