81716310001 has 4 divisors (see below), whose sum is σ = 81723632292. Its totient is φ = 81708987712.

The previous prime is 81716309993. The next prime is 81716310133. The reversal of 81716310001 is 10001361718.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70224470001 + 11491840000 = 264999^2 + 107200^2 .

It is a cyclic number.

It is not a de Polignac number, because 81716310001 - 2³ = 81716309993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81716310701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3644380 + ... + 3666733.

It is an arithmetic number, because the mean of its divisors is an integer number (20430908073).

Almost surely, 2^81716310001 is an apocalyptic number.

It is an amenable number.

81716310001 is a deficient number, since it is larger than the sum of its proper divisors (7322291).

81716310001 is a wasteful number, since it uses less digits than its factorization.

81716310001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7322290.

The product of its (nonzero) digits is 1008, while the sum is 28.

Adding to 81716310001 its reverse (10001361718), we get a palindrome (91717671719).

The spelling of 81716310001 in words is "eighty-one billion, seven hundred sixteen million, three hundred ten thousand, one".