81946011386 has 32 divisors (see below), whose sum is σ = 124923617280. Its totient is φ = 40309388784.

The previous prime is 81946011349. The next prime is 81946011391. The reversal of 81946011386 is 68311064918.

It is a self number, because there is not a number n which added to its sum of digits gives 81946011386.

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, 62889611 + ... + 62890913.

It is an arithmetic number, because the mean of its divisors is an integer number (3903863040).

Almost surely, 2^81946011386 is an apocalyptic number.

81946011386 is a deficient number, since it is larger than the sum of its proper divisors (42977605894).

81946011386 is a wasteful number, since it uses less digits than its factorization.

81946011386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2690.

The product of its (nonzero) digits is 248832, while the sum is 47.

The spelling of 81946011386 in words is "eighty-one billion, nine hundred forty-six million, eleven thousand, three hundred eighty-six".