81495096661 has 8 divisors (see below), whose sum is σ = 88906997664. Its totient is φ = 74083738320.

The previous prime is 81495096653. The next prime is 81495096671. The reversal of 81495096661 is 16669059418.

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 81495096661 - 2³ = 81495096653 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 (81495096671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218575 + ... + 459091.

It is an arithmetic number, because the mean of its divisors is an integer number (11113374708).

Almost surely, 2^81495096661 is an apocalyptic number.

It is an amenable number.

81495096661 is a deficient number, since it is larger than the sum of its proper divisors (7411901003).

81495096661 is a wasteful number, since it uses less digits than its factorization.

81495096661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271331.

The product of its (nonzero) digits is 2799360, while the sum is 55.

The spelling of 81495096661 in words is "eighty-one billion, four hundred ninety-five million, ninety-six thousand, six hundred sixty-one".