81663767300 has 18 divisors (see below), whose sum is σ = 177210375258. Its totient is φ = 32665506880.

The previous prime is 81663767299. The next prime is 81663767321. The reversal of 81663767300 is 376736618.

It can be written as a sum of positive squares in 3 ways, for example, as 13405934656 + 68257832644 = 115784^2 + 261262^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 408318737 + ... + 408318936.

Almost surely, 2^81663767300 is an apocalyptic number.

It is an amenable number.

81663767300 is an abundant number, since it is smaller than the sum of its proper divisors (95546607958).

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

81663767300 is a wasteful number, since it uses less digits than its factorization.

81663767300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816637687 (or 816637680 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 47.

The spelling of 81663767300 in words is "eighty-one billion, six hundred sixty-three million, seven hundred sixty-seven thousand, three hundred".