81006911722 has 16 divisors (see below), whose sum is σ = 132561158400. Its totient is φ = 36820103040.

The previous prime is 81006911719. The next prime is 81006911723. The reversal of 81006911722 is 22711960018.

It is not an unprimeable number, because it can be changed into a prime (81006911723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1166554 + ... + 1234042.

It is an arithmetic number, because the mean of its divisors is an integer number (8285072400).

Almost surely, 2^81006911722 is an apocalyptic number.

81006911722 is a deficient number, since it is larger than the sum of its proper divisors (51554246678).

81006911722 is a wasteful number, since it uses less digits than its factorization.

81006911722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122061.

The product of its (nonzero) digits is 12096, while the sum is 37.

The spelling of 81006911722 in words is "eighty-one billion, six million, nine hundred eleven thousand, seven hundred twenty-two".