81120858107 has 4 divisors (see below), whose sum is σ = 81121446576. Its totient is φ = 81120269640.

The previous prime is 81120858019. The next prime is 81120858157. The reversal of 81120858107 is 70185802118.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 70185802118 = 2 ⋅35092901059.

It is a cyclic number.

It is not a de Polignac number, because 81120858107 - 2²⁴ = 81104080891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81120858157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36353 + ... + 404429.

It is an arithmetic number, because the mean of its divisors is an integer number (20280361644).

Almost surely, 2^81120858107 is an apocalyptic number.

81120858107 is a deficient number, since it is larger than the sum of its proper divisors (588469).

81120858107 is a wasteful number, since it uses less digits than its factorization.

81120858107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588468.

The product of its (nonzero) digits is 35840, while the sum is 41.

The spelling of 81120858107 in words is "eighty-one billion, one hundred twenty million, eight hundred fifty-eight thousand, one hundred seven".