81406204081 has 8 divisors (see below), whose sum is σ = 82159404800. Its totient is φ = 80653119120.

The previous prime is 81406204067. The next prime is 81406204109. The reversal of 81406204081 is 18040260418.

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

It is a cyclic number.

It is not a de Polignac number, because 81406204081 - 2⁹ = 81406203569 is a prime.

It is a super-2 number, since 2×81406204081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81406204021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2109760 + ... + 2147998.

It is an arithmetic number, because the mean of its divisors is an integer number (10269925600).

Almost surely, 2^81406204081 is an apocalyptic number.

It is an amenable number.

81406204081 is a deficient number, since it is larger than the sum of its proper divisors (753200719).

81406204081 is a wasteful number, since it uses less digits than its factorization.

81406204081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57879.

The product of its (nonzero) digits is 12288, while the sum is 34.

Adding to 81406204081 its reverse (18040260418), we get a palindrome (99446464499).

The spelling of 81406204081 in words is "eighty-one billion, four hundred six million, two hundred four thousand, eighty-one".