81302948263 has 4 divisors (see below), whose sum is σ = 81303763288. Its totient is φ = 81302133240.

The previous prime is 81302948257. The next prime is 81302948267. The reversal of 81302948263 is 36284920318.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 81302948263 - 2⁹ = 81302947751 is a prime.

It is a super-2 number, since 2×81302948263² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81302948267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232956 + ... + 465697.

It is an arithmetic number, because the mean of its divisors is an integer number (20325940822).

Almost surely, 2^81302948263 is an apocalyptic number.

81302948263 is a deficient number, since it is larger than the sum of its proper divisors (815025).

81302948263 is a wasteful number, since it uses less digits than its factorization.

81302948263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 815024.

The product of its (nonzero) digits is 497664, while the sum is 46.

The spelling of 81302948263 in words is "eighty-one billion, three hundred two million, nine hundred forty-eight thousand, two hundred sixty-three".