81668576326 has 8 divisors (see below), whose sum is σ = 122556766104. Its totient is φ = 40816320960.

The previous prime is 81668576321. The next prime is 81668576371. The reversal of 81668576326 is 62367586618.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81668576321) 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, 8977920 + ... + 8987011.

It is an arithmetic number, because the mean of its divisors is an integer number (15319595763).

Almost surely, 2^81668576326 is an apocalyptic number.

81668576326 is a deficient number, since it is larger than the sum of its proper divisors (40888189778).

81668576326 is a wasteful number, since it uses less digits than its factorization.

81668576326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17967206.

The product of its digits is 17418240, while the sum is 58.

The spelling of 81668576326 in words is "eighty-one billion, six hundred sixty-eight million, five hundred seventy-six thousand, three hundred twenty-six".