81791846396 has 24 divisors (see below), whose sum is σ = 156257770704. Its totient is φ = 37232956800.

The previous prime is 81791846393. The next prime is 81791846417. The reversal of 81791846396 is 69364819718.

It is a super-2 number, since 2×81791846396² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81791846393) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 10769630 + ... + 10777221.

It is an arithmetic number, because the mean of its divisors is an integer number (6510740446).

Almost surely, 2^81791846396 is an apocalyptic number.

It is an amenable number.

81791846396 is a deficient number, since it is larger than the sum of its proper divisors (74465924308).

81791846396 is a wasteful number, since it uses less digits than its factorization.

81791846396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21546941 (or 21546939 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 62.

The spelling of 81791846396 in words is "eighty-one billion, seven hundred ninety-one million, eight hundred forty-six thousand, three hundred ninety-six".