81600873615 has 24 divisors (see below), whose sum is σ = 141470231760. Its totient is φ = 43511629824.

The previous prime is 81600873581. The next prime is 81600873617. The reversal of 81600873615 is 51637800618.

81600873615 is a `hidden beast` number, since 8 + 1 + 600 + 8 + 7 + 36 + 1 + 5 = 666.

It is not a de Polignac number, because 81600873615 - 2⁶ = 81600873551 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81600873617) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43096 + ... + 406274.

It is an arithmetic number, because the mean of its divisors is an integer number (5894592990).

Almost surely, 2^81600873615 is an apocalyptic number.

81600873615 is a deficient number, since it is larger than the sum of its proper divisors (59869358145).

81600873615 is a wasteful number, since it uses less digits than its factorization.

81600873615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368183 (or 368180 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 81600873615 in words is "eighty-one billion, six hundred million, eight hundred seventy-three thousand, six hundred fifteen".