81350328821 has 8 divisors (see below), whose sum is σ = 81456881664. Its totient is φ = 81243827280.

The previous prime is 81350328817. The next prime is 81350328823. The reversal of 81350328821 is 12882305318.

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 81350328821 - 2² = 81350328817 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 (81350328823) 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, 3920951 + ... + 3941643.

It is an arithmetic number, because the mean of its divisors is an integer number (10182110208).

Almost surely, 2^81350328821 is an apocalyptic number.

It is an amenable number.

81350328821 is a deficient number, since it is larger than the sum of its proper divisors (106552843).

81350328821 is a wasteful number, since it uses less digits than its factorization.

81350328821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25651.

The product of its (nonzero) digits is 92160, while the sum is 41.

The spelling of 81350328821 in words is "eighty-one billion, three hundred fifty million, three hundred twenty-eight thousand, eight hundred twenty-one".