81167197472 has 24 divisors (see below), whose sum is σ = 160514516736. Its totient is φ = 40401605952.

The previous prime is 81167197453. The next prime is 81167197481. The reversal of 81167197472 is 27479176118.

It is a super-2 number, since 2×81167197472² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5680028 + ... + 5694299.

It is an arithmetic number, because the mean of its divisors is an integer number (6688104864).

Almost surely, 2^81167197472 is an apocalyptic number.

It is an amenable number.

81167197472 is a deficient number, since it is larger than the sum of its proper divisors (79347319264).

81167197472 is a wasteful number, since it uses less digits than its factorization.

81167197472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11374560 (or 11374552 counting only the distinct ones).

The product of its digits is 1185408, while the sum is 53.

The spelling of 81167197472 in words is "eighty-one billion, one hundred sixty-seven million, one hundred ninety-seven thousand, four hundred seventy-two".