81455747980176 has 60 divisors (see below), whose sum is σ = 231085741683628. Its totient is φ = 26779971935232.

The previous prime is 81455747980151. The next prime is 81455747980181. The reversal of 81455747980176 is 67108974755418.

81455747980176 is a `hidden beast` number, since 8 + 1 + 4 + 5 + 5 + 7 + 479 + 80 + 1 + 76 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 40537721221776 + 40918026758400 = 6366924^2 + 6396720^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

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, 3874406725 + ... + 3874427748.

Almost surely, 2^{81455747980176} is an apocalyptic number.

It is an amenable number.

81455747980176 is an abundant number, since it is smaller than the sum of its proper divisors (149629993703452).

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

81455747980176 is a wasteful number, since it uses less digits than its factorization.

81455747980176 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7748834560 (or 7748834551 counting only the distinct ones).

The product of its (nonzero) digits is 474163200, while the sum is 72.

The spelling of 81455747980176 in words is "eighty-one trillion, four hundred fifty-five billion, seven hundred forty-seven million, nine hundred eighty thousand, one hundred seventy-six".