81040334470 has 32 divisors (see below), whose sum is σ = 149848525728. Its totient is φ = 31532986368.

The previous prime is 81040334467. The next prime is 81040334519. The reversal of 81040334470 is 7443304018.

It is a super-2 number, since 2×81040334470² (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 (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1825477 + ... + 1869343.

It is an arithmetic number, because the mean of its divisors is an integer number (4682766429).

Almost surely, 2^81040334470 is an apocalyptic number.

81040334470 is a deficient number, since it is larger than the sum of its proper divisors (68808191258).

81040334470 is a wasteful number, since it uses less digits than its factorization.

81040334470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48904.

The product of its (nonzero) digits is 32256, while the sum is 34.

Adding to 81040334470 its reverse (7443304018), we get a palindrome (88483638488).

The spelling of 81040334470 in words is "eighty-one billion, forty million, three hundred thirty-four thousand, four hundred seventy".