81922135178414 has 32 divisors (see below), whose sum is σ = 130509145166400. Its totient is φ = 38433851546112.

The previous prime is 81922135178381. The next prime is 81922135178441. The reversal of 81922135178414 is 41487153122918.

It is a super-2 number, since 2×81922135178414² (a number of 29 digits) contains 22 as substring.

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 81922135178414.

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, 62274452 + ... + 63576344.

It is an arithmetic number, because the mean of its divisors is an integer number (4078410786450).

Almost surely, 2^{81922135178414} is an apocalyptic number.

81922135178414 is a deficient number, since it is larger than the sum of its proper divisors (48587009987986).

81922135178414 is a wasteful number, since it uses less digits than its factorization.

81922135178414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307564.

The product of its digits is 3870720, while the sum is 56.

The spelling of 81922135178414 in words is "eighty-one trillion, nine hundred twenty-two billion, one hundred thirty-five million, one hundred seventy-eight thousand, four hundred fourteen".