81071512468 has 12 divisors (see below), whose sum is σ = 144200969332. Its totient is φ = 39871235520.

The previous prime is 81071512453. The next prime is 81071512477. The reversal of 81071512468 is 86421517018.

It can be written as a sum of positive squares in 2 ways, for example, as 6125879824 + 74945632644 = 78268^2 + 273762^2 .

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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, 166129905 + ... + 166130392.

Almost surely, 2^81071512468 is an apocalyptic number.

It is an amenable number.

81071512468 is a deficient number, since it is larger than the sum of its proper divisors (63129456864).

81071512468 is a wasteful number, since it uses less digits than its factorization.

81071512468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332260362 (or 332260360 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 43.

The spelling of 81071512468 in words is "eighty-one billion, seventy-one million, five hundred twelve thousand, four hundred sixty-eight".