81925881798 has 16 divisors (see below), whose sum is σ = 163855932480. Its totient is φ = 27307932456.

The previous prime is 81925881797. The next prime is 81925881883. The reversal of 81925881798 is 89718852918.

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, 119961 + ... + 422187.

It is an arithmetic number, because the mean of its divisors is an integer number (10240995780).

Almost surely, 2^81925881798 is an apocalyptic number.

81925881798 is an abundant number, since it is smaller than the sum of its proper divisors (81930050682).

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

81925881798 is a wasteful number, since it uses less digits than its factorization.

81925881798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347411.

The product of its digits is 23224320, while the sum is 66.

The spelling of 81925881798 in words is "eighty-one billion, nine hundred twenty-five million, eight hundred eighty-one thousand, seven hundred ninety-eight".