81837741895 has 16 divisors (see below), whose sum is σ = 120868050240. Its totient is φ = 51800592384.

The previous prime is 81837741851. The next prime is 81837741901. The reversal of 81837741895 is 59814773818.

It is a cyclic number.

It is not a de Polignac number, because 81837741895 - 2⁷ = 81837741767 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89931130 + ... + 89932039.

It is an arithmetic number, because the mean of its divisors is an integer number (7554253140).

Almost surely, 2^81837741895 is an apocalyptic number.

81837741895 is a deficient number, since it is larger than the sum of its proper divisors (39030308345).

81837741895 is a wasteful number, since it uses less digits than its factorization.

81837741895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179863194.

The product of its digits is 13547520, while the sum is 61.

The spelling of 81837741895 in words is "eighty-one billion, eight hundred thirty-seven million, seven hundred forty-one thousand, eight hundred ninety-five".