81692005001 has 4 divisors (see below), whose sum is σ = 81824407572. Its totient is φ = 81559602432.

The previous prime is 81692004991. The next prime is 81692005013. The reversal of 81692005001 is 10050029618.

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 45774174601 + 35917830400 = 213949^2 + 189520^2 .

It is a cyclic number.

It is not a de Polignac number, because 81692005001 - 2²² = 81687810697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81692005051) 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, 66200360 + ... + 66201593.

It is an arithmetic number, because the mean of its divisors is an integer number (20456101893).

Almost surely, 2^81692005001 is an apocalyptic number.

It is an amenable number.

81692005001 is a deficient number, since it is larger than the sum of its proper divisors (132402571).

81692005001 is a wasteful number, since it uses less digits than its factorization.

81692005001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132402570.

The product of its (nonzero) digits is 4320, while the sum is 32.

The spelling of 81692005001 in words is "eighty-one billion, six hundred ninety-two million, five thousand, one".