81140675443 has 4 divisors (see below), whose sum is σ = 81250474120. Its totient is φ = 81030876768.

The previous prime is 81140675437. The next prime is 81140675449. The reversal of 81140675443 is 34457604118.

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

It is an interprime number because it is at equal distance from previous prime (81140675437) and next prime (81140675449).

It is a cyclic number.

It is not a de Polignac number, because 81140675443 - 2⁵ = 81140675411 is a prime.

It is a super-2 number, since 2×81140675443² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81140675443.

It is not an unprimeable number, because it can be changed into a prime (81140675449) 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, 54898230 + ... + 54899707.

It is an arithmetic number, because the mean of its divisors is an integer number (20312618530).

Almost surely, 2^81140675443 is an apocalyptic number.

81140675443 is a deficient number, since it is larger than the sum of its proper divisors (109798677).

81140675443 is a wasteful number, since it uses less digits than its factorization.

81140675443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109798676.

The product of its (nonzero) digits is 322560, while the sum is 43.

The spelling of 81140675443 in words is "eighty-one billion, one hundred forty million, six hundred seventy-five thousand, four hundred forty-three".