81653842320783 has 4 divisors (see below), whose sum is σ = 108871789761048. Its totient is φ = 54435894880520.

The previous prime is 81653842320779. The next prime is 81653842320851. The reversal of 81653842320783 is 38702324835618.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81653842320783 - 2² = 81653842320779 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81653842322783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13608973720128 + ... + 13608973720133.

It is an arithmetic number, because the mean of its divisors is an integer number (27217947440262).

Almost surely, 2^{81653842320783} is an apocalyptic number.

81653842320783 is a deficient number, since it is larger than the sum of its proper divisors (27217947440265).

81653842320783 is a wasteful number, since it uses less digits than its factorization.

81653842320783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27217947440264.

The product of its (nonzero) digits is 46448640, while the sum is 60.

The spelling of 81653842320783 in words is "eighty-one trillion, six hundred fifty-three billion, eight hundred forty-two million, three hundred twenty thousand, seven hundred eighty-three".