81860552307 has 12 divisors (see below), whose sum is σ = 118450835880. Its totient is φ = 54477786528.

The previous prime is 81860552273. The next prime is 81860552321. The reversal of 81860552307 is 70325506818.

81860552307 is a `hidden beast` number, since 8 + 1 + 8 + 60 + 552 + 30 + 7 = 666.

It is not a de Polignac number, because 81860552307 - 2¹¹ = 81860550259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81860552507) 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 11 ways as a sum of consecutive naturals, for example, 7987513 + ... + 7997754.

It is an arithmetic number, because the mean of its divisors is an integer number (9870902990).

Almost surely, 2^81860552307 is an apocalyptic number.

81860552307 is a deficient number, since it is larger than the sum of its proper divisors (36590283573).

81860552307 is a wasteful number, since it uses less digits than its factorization.

81860552307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15985842 (or 15985839 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The spelling of 81860552307 in words is "eighty-one billion, eight hundred sixty million, five hundred fifty-two thousand, three hundred seven".