81103599360 has 864 divisors, whose sum is σ = 336720384000. Its totient is φ = 17631903744.

The previous prime is 81103599347. The next prime is 81103599457. The reversal of 81103599360 is 6399530118.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 184746021 + ... + 184746459.

Almost surely, 2^81103599360 is an apocalyptic number.

81103599360 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 81103599360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168360192000).

81103599360 is an abundant number, since it is smaller than the sum of its proper divisors (255616784640).

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

81103599360 is a wasteful number, since it uses less digits than its factorization.

81103599360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581 (or 564 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The spelling of 81103599360 in words is "eighty-one billion, one hundred three million, five hundred ninety-nine thousand, three hundred sixty".