81473891512012 has 48 divisors (see below), whose sum is σ = 144718682768352. Its totient is φ = 40127165337600.

The previous prime is 81473891512003. The next prime is 81473891512093. The reversal of 81473891512012 is 21021519837418.

It is a happy number.

It is a super-2 number, since 2×81473891512012² (a number of 29 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 786550368 + ... + 786653944.

It is an arithmetic number, because the mean of its divisors is an integer number (3014972557674).

Almost surely, 2^{81473891512012} is an apocalyptic number.

It is an amenable number.

81473891512012 is a deficient number, since it is larger than the sum of its proper divisors (63244791256340).

81473891512012 is a wasteful number, since it uses less digits than its factorization.

81473891512012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107098 (or 107096 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 52.

The spelling of 81473891512012 in words is "eighty-one trillion, four hundred seventy-three billion, eight hundred ninety-one million, five hundred twelve thousand, twelve".