81705916722 has 16 divisors (see below), whose sum is σ = 163460493792. Its totient is φ = 27227195520.

The previous prime is 81705916711. The next prime is 81705916727. The reversal of 81705916722 is 22761950718.

It is not an unprimeable number, because it can be changed into a prime (81705916727) 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, 2005668 + ... + 2045999.

It is an arithmetic number, because the mean of its divisors is an integer number (10216280862).

Almost surely, 2^81705916722 is an apocalyptic number.

81705916722 is an abundant number, since it is smaller than the sum of its proper divisors (81754577070).

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

81705916722 is a wasteful number, since it uses less digits than its factorization.

81705916722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4055033.

The product of its (nonzero) digits is 423360, while the sum is 48.

The spelling of 81705916722 in words is "eighty-one billion, seven hundred five million, nine hundred sixteen thousand, seven hundred twenty-two".