81141613056 has 160 divisors (see below), whose sum is σ = 274497252480. Its totient is φ = 23183290368.

The previous prime is 81141612989. The next prime is 81141613081. The reversal of 81141613056 is 65031614118.

It is a happy number.

It is a super-2 number, since 2×81141613056² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 81141613056.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 322491 + ... + 516026.

It is an arithmetic number, because the mean of its divisors is an integer number (1715607828).

Almost surely, 2^81141613056 is an apocalyptic number.

It is an amenable number.

81141613056 is an abundant number, since it is smaller than the sum of its proper divisors (193355639424).

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

81141613056 is an equidigital number, since it uses as much as digits as its factorization.

81141613056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838551 (or 838529 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The spelling of 81141613056 in words is "eighty-one billion, one hundred forty-one million, six hundred thirteen thousand, fifty-six".