81327692017 has 64 divisors (see below), whose sum is σ = 104523955200. Its totient is φ = 62136910080.

The previous prime is 81327692009. The next prime is 81327692027. The reversal of 81327692017 is 71029672318.

It is a cyclic number.

It is not a de Polignac number, because 81327692017 - 2³ = 81327692009 is a prime.

It is a super-2 number, since 2×81327692017² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81327692027) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17883738 + ... + 17888284.

It is an arithmetic number, because the mean of its divisors is an integer number (1633186800).

Almost surely, 2^81327692017 is an apocalyptic number.

It is an amenable number.

81327692017 is a deficient number, since it is larger than the sum of its proper divisors (23196263183).

81327692017 is a wasteful number, since it uses less digits than its factorization.

81327692017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4846.

The product of its (nonzero) digits is 254016, while the sum is 46.

The spelling of 81327692017 in words is "eighty-one billion, three hundred twenty-seven million, six hundred ninety-two thousand, seventeen".