81427558080 has 224 divisors, whose sum is σ = 282239435520. Its totient is φ = 19725742080.

The previous prime is 81427558033. The next prime is 81427558109. The reversal of 81427558080 is 8085572418.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 26810322 + ... + 26813358.

It is an arithmetic number, because the mean of its divisors is an integer number (1259997480).

Almost surely, 2^81427558080 is an apocalyptic number.

81427558080 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 81427558080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141119717760).

81427558080 is an abundant number, since it is smaller than the sum of its proper divisors (200811877440).

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

81427558080 is a wasteful number, since it uses less digits than its factorization.

81427558080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5607 (or 5597 counting only the distinct ones).

The product of its (nonzero) digits is 716800, while the sum is 48.

The spelling of 81427558080 in words is "eighty-one billion, four hundred twenty-seven million, five hundred fifty-eight thousand, eighty".