81747313383 has 16 divisors (see below), whose sum is σ = 109985496192. Its totient is φ = 54004860000.

The previous prime is 81747313343. The next prime is 81747313387. The reversal of 81747313383 is 38331374718.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-81747313383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81747313387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127128 + ... + 423858.

It is an arithmetic number, because the mean of its divisors is an integer number (6874093512).

Almost surely, 2^81747313383 is an apocalyptic number.

81747313383 is a deficient number, since it is larger than the sum of its proper divisors (28238182809).

81747313383 is a wasteful number, since it uses less digits than its factorization.

81747313383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297566.

The product of its digits is 1016064, while the sum is 48.

The spelling of 81747313383 in words is "eighty-one billion, seven hundred forty-seven million, three hundred thirteen thousand, three hundred eighty-three".