81180725481600 has 96 divisors (see below), whose sum is σ = 267389014586640. Its totient is φ = 21648193459200.

The previous prime is 81180725481521. The next prime is 81180725481601. The reversal of 81180725481600 is 618452708118.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (81180725481601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4228153186 + ... + 4228172385.

Almost surely, 2^{81180725481600} is an apocalyptic number.

81180725481600 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81180725481600 is an abundant number, since it is smaller than the sum of its proper divisors (186208289105040).

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

81180725481600 is a wasteful number, since it uses less digits than its factorization.

81180725481600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8456325598 (or 8456325581 counting only the distinct ones).

The product of its (nonzero) digits is 860160, while the sum is 51.

The spelling of 81180725481600 in words is "eighty-one trillion, one hundred eighty billion, seven hundred twenty-five million, four hundred eighty-one thousand, six hundred".