81624136082 has 8 divisors (see below), whose sum is σ = 122442567996. Its totient is φ = 40809946752.

The previous prime is 81624136043. The next prime is 81624136157. The reversal of 81624136082 is 28063142618.

It can be written as a sum of positive squares in 2 ways, for example, as 51338043241 + 30286092841 = 226579^2 + 174029^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×81624136082² (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 3 ways as a sum of consecutive naturals, for example, 1012103 + ... + 1089770.

Almost surely, 2^81624136082 is an apocalyptic number.

81624136082 is a deficient number, since it is larger than the sum of its proper divisors (40818431914).

81624136082 is a wasteful number, since it uses less digits than its factorization.

81624136082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121292.

The product of its (nonzero) digits is 110592, while the sum is 41.

The spelling of 81624136082 in words is "eighty-one billion, six hundred twenty-four million, one hundred thirty-six thousand, eighty-two".