81925881799 has 8 divisors (see below), whose sum is σ = 83994826608. Its totient is φ = 79860306240.

The previous prime is 81925881797. The next prime is 81925881883. The reversal of 81925881799 is 99718852918.

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

It is a cyclic number.

It is not a de Polignac number, because 81925881799 - 2¹ = 81925881797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81925881797) 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, 793032 + ... + 890365.

It is an arithmetic number, because the mean of its divisors is an integer number (10499353326).

Almost surely, 2^81925881799 is an apocalyptic number.

81925881799 is a deficient number, since it is larger than the sum of its proper divisors (2068944809).

81925881799 is a wasteful number, since it uses less digits than its factorization.

81925881799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1684625.

The product of its digits is 26127360, while the sum is 67.

The spelling of 81925881799 in words is "eighty-one billion, nine hundred twenty-five million, eight hundred eighty-one thousand, seven hundred ninety-nine".