81980059392 has 1152 divisors, whose sum is σ = 325574860800. Its totient is φ = 19871723520.

The previous prime is 81980059391. The next prime is 81980059423. The reversal of 81980059392 is 29395008918.

It is a tau number, because it is divible by the number of its divisors (1152).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81980059391) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1223582943 + ... + 1223583009.

Almost surely, 2^81980059392 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81980059392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162787430400).

81980059392 is an abundant number, since it is smaller than the sum of its proper divisors (243594801408).

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

81980059392 is a wasteful number, since it uses less digits than its factorization.

81980059392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151 (or 109 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 54.

The spelling of 81980059392 in words is "eighty-one billion, nine hundred eighty million, fifty-nine thousand, three hundred ninety-two".