81319469316 has 24 divisors (see below), whose sum is σ = 190793750784. Its totient is φ = 26956729440.

The previous prime is 81319469303. The next prime is 81319469321. The reversal of 81319469316 is 61396491318.

It is a super-2 number, since 2×81319469316² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18717780 + ... + 18722123.

It is an arithmetic number, because the mean of its divisors is an integer number (7949739616).

Almost surely, 2^81319469316 is an apocalyptic number.

It is an amenable number.

81319469316 is an abundant number, since it is smaller than the sum of its proper divisors (109474281468).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81319469316 is a wasteful number, since it uses less digits than its factorization.

81319469316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37440091 (or 37440089 counting only the distinct ones).

The product of its digits is 839808, while the sum is 51.

The spelling of 81319469316 in words is "eighty-one billion, three hundred nineteen million, four hundred sixty-nine thousand, three hundred sixteen".