81585281701 has 24 divisors (see below), whose sum is σ = 103653644544. Its totient is φ = 63498919680.

The previous prime is 81585281693. The next prime is 81585281737. The reversal of 81585281701 is 10718258518.

It is not a de Polignac number, because 81585281701 - 2³ = 81585281693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81585287701) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 377461 + ... + 552853.

It is an arithmetic number, because the mean of its divisors is an integer number (4318901856).

Almost surely, 2^81585281701 is an apocalyptic number.

It is an amenable number.

81585281701 is a deficient number, since it is larger than the sum of its proper divisors (22068362843).

81585281701 is a wasteful number, since it uses less digits than its factorization.

81585281701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176281 (or 176274 counting only the distinct ones).

The product of its (nonzero) digits is 179200, while the sum is 46.

The spelling of 81585281701 in words is "eighty-one billion, five hundred eighty-five million, two hundred eighty-one thousand, seven hundred one".