81249408083 has 8 divisors (see below), whose sum is σ = 84075500880. Its totient is φ = 78424941280.

The previous prime is 81249408067. The next prime is 81249408127. The reversal of 81249408083 is 38080494218.

It is a happy number.

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

It is not a de Polignac number, because 81249408083 - 2⁴ = 81249408067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81249408883) 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, 304385 + ... + 505122.

It is an arithmetic number, because the mean of its divisors is an integer number (10509437610).

Almost surely, 2^81249408083 is an apocalyptic number.

81249408083 is a deficient number, since it is larger than the sum of its proper divisors (2826092797).

81249408083 is a wasteful number, since it uses less digits than its factorization.

81249408083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812997.

The product of its (nonzero) digits is 442368, while the sum is 47.

The spelling of 81249408083 in words is "eighty-one billion, two hundred forty-nine million, four hundred eight thousand, eighty-three".