81071896880 has 160 divisors (see below), whose sum is σ = 210247876608. Its totient is φ = 28870732800.

The previous prime is 81071896877. The next prime is 81071896891. The reversal of 81071896880 is 8869817018.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9893585 + ... + 9901775.

Almost surely, 2^81071896880 is an apocalyptic number.

81071896880 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81071896880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105123938304).

81071896880 is an abundant number, since it is smaller than the sum of its proper divisors (129175979728).

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

81071896880 is a wasteful number, since it uses less digits than its factorization.

81071896880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8555 (or 8549 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 56.

The spelling of 81071896880 in words is "eighty-one billion, seventy-one million, eight hundred ninety-six thousand, eight hundred eighty".