81741195215 has 4 divisors (see below), whose sum is σ = 98089434264. Its totient is φ = 65392956168.

The previous prime is 81741195209. The next prime is 81741195229. The reversal of 81741195215 is 51259114718.

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 81741195215 - 2⁴ = 81741195199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8174119517 + ... + 8174119526.

It is an arithmetic number, because the mean of its divisors is an integer number (24522358566).

Almost surely, 2^81741195215 is an apocalyptic number.

81741195215 is a deficient number, since it is larger than the sum of its proper divisors (16348239049).

81741195215 is a wasteful number, since it uses less digits than its factorization.

81741195215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16348239048.

The product of its digits is 100800, while the sum is 44.

The spelling of 81741195215 in words is "eighty-one billion, seven hundred forty-one million, one hundred ninety-five thousand, two hundred fifteen".