81100609407 has 24 divisors (see below), whose sum is σ = 121599092160. Its totient is φ = 52049206080.

The previous prime is 81100609399. The next prime is 81100609417. The reversal of 81100609407 is 70490600118.

81100609407 is a `hidden beast` number, since 8 + 1 + 1 + 0 + 0 + 609 + 40 + 7 = 666.

It is not a de Polignac number, because 81100609407 - 2³ = 81100609399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81100609417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1545732 + ... + 1597337.

It is an arithmetic number, because the mean of its divisors is an integer number (5066628840).

Almost surely, 2^81100609407 is an apocalyptic number.

81100609407 is a deficient number, since it is larger than the sum of its proper divisors (40498482753).

81100609407 is a wasteful number, since it uses less digits than its factorization.

81100609407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3143183 (or 3143180 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The spelling of 81100609407 in words is "eighty-one billion, one hundred million, six hundred nine thousand, four hundred seven".