81569495348 has 12 divisors (see below), whose sum is σ = 155723582112. Its totient is φ = 37077043320.

The previous prime is 81569495339. The next prime is 81569495383. The reversal of 81569495348 is 84359496518.

It is a super-2 number, since 2×81569495348² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 926926040 + ... + 926926127.

It is an arithmetic number, because the mean of its divisors is an integer number (12976965176).

Almost surely, 2^81569495348 is an apocalyptic number.

It is an amenable number.

81569495348 is a deficient number, since it is larger than the sum of its proper divisors (74154086764).

81569495348 is a wasteful number, since it uses less digits than its factorization.

81569495348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1853852182 (or 1853852180 counting only the distinct ones).

The product of its digits is 37324800, while the sum is 62.

The spelling of 81569495348 in words is "eighty-one billion, five hundred sixty-nine million, four hundred ninety-five thousand, three hundred forty-eight".