81416361691334 has 16 divisors (see below), whose sum is σ = 122291710035840. Its totient is φ = 40652492610240.

The previous prime is 81416361691331. The next prime is 81416361691381. The reversal of 81416361691334 is 43319616361418.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81416361691334.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81416361691331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3811247 + ... + 13317594.

It is an arithmetic number, because the mean of its divisors is an integer number (7643231877240).

Almost surely, 2^{81416361691334} is an apocalyptic number.

81416361691334 is a deficient number, since it is larger than the sum of its proper divisors (40875348344506).

81416361691334 is a wasteful number, since it uses less digits than its factorization.

81416361691334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17132095.

The product of its digits is 6718464, while the sum is 56.

The spelling of 81416361691334 in words is "eighty-one trillion, four hundred sixteen billion, three hundred sixty-one million, six hundred ninety-one thousand, three hundred thirty-four".