81768168800 has 36 divisors (see below), whose sum is σ = 199616544036. Its totient is φ = 32707267200.

The previous prime is 81768168791. The next prime is 81768168857. The reversal of 81768168800 is 886186718.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 51104306 + ... + 51105905.

It is an arithmetic number, because the mean of its divisors is an integer number (5544904001).

Almost surely, 2^81768168800 is an apocalyptic number.

81768168800 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81768168800 is an abundant number, since it is smaller than the sum of its proper divisors (117848375236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81768168800 is a wasteful number, since it uses less digits than its factorization.

81768168800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102210231 (or 102210218 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 53.

The spelling of 81768168800 in words is "eighty-one billion, seven hundred sixty-eight million, one hundred sixty-eight thousand, eight hundred".