81598841600 has 108 divisors (see below), whose sum is σ = 202124823600. Its totient is φ = 32614502400.

The previous prime is 81598841579. The next prime is 81598841617. The reversal of 81598841600 is 614889518.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9909485 + ... + 9917715.

Almost surely, 2^81598841600 is an apocalyptic number.

81598841600 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 81598841600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101062411800).

81598841600 is an abundant number, since it is smaller than the sum of its proper divisors (120525982000).

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

81598841600 is a wasteful number, since it uses less digits than its factorization.

81598841600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9806 (or 9787 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 50.

The spelling of 81598841600 in words is "eighty-one billion, five hundred ninety-eight million, eight hundred forty-one thousand, six hundred".