81594777600 has 1536 divisors, whose sum is σ = 374461747200. Its totient is φ = 16986931200.

The previous prime is 81594777521. The next prime is 81594777613. The reversal of 81594777600 is 677749518.

It is a tau number, because it is divible by the number of its divisors (1536).

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

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, 2632089585 + ... + 2632089615.

It is an arithmetic number, because the mean of its divisors is an integer number (243790200).

Almost surely, 2^81594777600 is an apocalyptic number.

81594777600 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 81594777600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187230873600).

81594777600 is an abundant number, since it is smaller than the sum of its proper divisors (292866969600).

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

81594777600 is a wasteful number, since it uses less digits than its factorization.

81594777600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104 (or 65 counting only the distinct ones).

The product of its (nonzero) digits is 2963520, while the sum is 54.

The spelling of 81594777600 in words is "eighty-one billion, five hundred ninety-four million, seven hundred seventy-seven thousand, six hundred".