81920474799 has 8 divisors (see below), whose sum is σ = 109704275760. Its totient is φ = 54375161856.

The previous prime is 81920474773. The next prime is 81920474809. The reversal of 81920474799 is 99747402918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81920474799 - 2¹⁵ = 81920442031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81920474759) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59621202 + ... + 59622575.

It is an arithmetic number, because the mean of its divisors is an integer number (13713034470).

Almost surely, 2^81920474799 is an apocalyptic number.

81920474799 is a deficient number, since it is larger than the sum of its proper divisors (27783800961).

81920474799 is a wasteful number, since it uses less digits than its factorization.

81920474799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119244009.

The product of its (nonzero) digits is 9144576, while the sum is 60.

The spelling of 81920474799 in words is "eighty-one billion, nine hundred twenty million, four hundred seventy-four thousand, seven hundred ninety-nine".