81140714147 has 4 divisors (see below), whose sum is σ = 81779617536. Its totient is φ = 80501810760.

The previous prime is 81140714143. The next prime is 81140714191. The reversal of 81140714147 is 74141704118.

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 81140714147 - 2² = 81140714143 is a prime.

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 81140714147.

It is not an unprimeable number, because it can be changed into a prime (81140714143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319451504 + ... + 319451757.

It is an arithmetic number, because the mean of its divisors is an integer number (20444904384).

Almost surely, 2^81140714147 is an apocalyptic number.

81140714147 is a deficient number, since it is larger than the sum of its proper divisors (638903389).

81140714147 is a wasteful number, since it uses less digits than its factorization.

81140714147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638903388.

The product of its (nonzero) digits is 25088, while the sum is 38.

The spelling of 81140714147 in words is "eighty-one billion, one hundred forty million, seven hundred fourteen thousand, one hundred forty-seven".