81113834015 has 4 divisors (see below), whose sum is σ = 97336600824. Its totient is φ = 64891067208.

The previous prime is 81113833987. The next prime is 81113834023. The reversal of 81113834015 is 51043831118.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81113834015 - 2¹⁰ = 81113832991 is a prime.

It is a super-2 number, since 2×81113834015² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8111383397 + ... + 8111383406.

It is an arithmetic number, because the mean of its divisors is an integer number (24334150206).

Almost surely, 2^81113834015 is an apocalyptic number.

81113834015 is a deficient number, since it is larger than the sum of its proper divisors (16222766809).

81113834015 is a wasteful number, since it uses less digits than its factorization.

81113834015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16222766808.

The product of its (nonzero) digits is 11520, while the sum is 35.

The spelling of 81113834015 in words is "eighty-one billion, one hundred thirteen million, eight hundred thirty-four thousand, fifteen".