81630824373 has 12 divisors (see below), whose sum is σ = 134755646688. Its totient is φ = 46646185320.

The previous prime is 81630824357. The next prime is 81630824411. The reversal of 81630824373 is 37342803618.

81630824373 is a `hidden beast` number, since 8 + 1 + 630 + 8 + 2 + 4 + 3 + 7 + 3 = 666.

It is not a de Polignac number, because 81630824373 - 2⁴ = 81630824357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81630824573) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 647863623 + ... + 647863748.

It is an arithmetic number, because the mean of its divisors is an integer number (11229637224).

Almost surely, 2^81630824373 is an apocalyptic number.

It is an amenable number.

81630824373 is a deficient number, since it is larger than the sum of its proper divisors (53124822315).

81630824373 is a wasteful number, since it uses less digits than its factorization.

81630824373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295727384 (or 1295727381 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The spelling of 81630824373 in words is "eighty-one billion, six hundred thirty million, eight hundred twenty-four thousand, three hundred seventy-three".