81330340783 has 2 divisors, whose sum is σ = 81330340784. Its totient is φ = 81330340782.

The previous prime is 81330340771. The next prime is 81330340813. The reversal of 81330340783 is 38704303318.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81330340783 - 2²⁹ = 80793469871 is a prime.

It is a super-2 number, since 2×81330340783² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81330340753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40665170391 + 40665170392.

It is an arithmetic number, because the mean of its divisors is an integer number (40665170392).

Almost surely, 2^81330340783 is an apocalyptic number.

81330340783 is a deficient number, since it is larger than the sum of its proper divisors (1).

81330340783 is an equidigital number, since it uses as much as digits as its factorization.

81330340783 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 40.

The spelling of 81330340783 in words is "eighty-one billion, three hundred thirty million, three hundred forty thousand, seven hundred eighty-three".