81034840715 has 4 divisors (see below), whose sum is σ = 97241808864. Its totient is φ = 64827872568.

The previous prime is 81034840699. The next prime is 81034840717. The reversal of 81034840715 is 51704843018.

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 81034840715 - 2⁴ = 81034840699 is a prime.

It is a super-2 number, since 2×81034840715² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81034840717) 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, 8103484067 + ... + 8103484076.

It is an arithmetic number, because the mean of its divisors is an integer number (24310452216).

Almost surely, 2^81034840715 is an apocalyptic number.

81034840715 is a deficient number, since it is larger than the sum of its proper divisors (16206968149).

81034840715 is a wasteful number, since it uses less digits than its factorization.

81034840715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16206968148.

The product of its (nonzero) digits is 107520, while the sum is 41.

The spelling of 81034840715 in words is "eighty-one billion, thirty-four million, eight hundred forty thousand, seven hundred fifteen".