81701427722 has 8 divisors (see below), whose sum is σ = 122574533796. Its totient is φ = 40843249792.

The previous prime is 81701427697. The next prime is 81701427757. The reversal of 81701427722 is 22772410718.

It can be written as a sum of positive squares in 2 ways, for example, as 69094853881 + 12606573841 = 262859^2 + 112279^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 81701427722.

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, 3718343 + ... + 3740250.

Almost surely, 2^81701427722 is an apocalyptic number.

81701427722 is a deficient number, since it is larger than the sum of its proper divisors (40873106074).

81701427722 is a wasteful number, since it uses less digits than its factorization.

81701427722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7464072.

The product of its (nonzero) digits is 87808, while the sum is 41.

The spelling of 81701427722 in words is "eighty-one billion, seven hundred one million, four hundred twenty-seven thousand, seven hundred twenty-two".