81219591446094 has 64 divisors (see below), whose sum is σ = 180689960911680. Its totient is φ = 27042908106240.

The previous prime is 81219591446093. The next prime is 81219591446113. The reversal of 81219591446094 is 49064419591218.

81219591446094 is a `hidden beast` number, since 8 + 1 + 2 + 1 + 9 + 5 + 9 + 14 + 4 + 609 + 4 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81219591446093) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 381498244 + ... + 381711080.

It is an arithmetic number, because the mean of its divisors is an integer number (2823280639245).

Almost surely, 2^{81219591446094} is an apocalyptic number.

81219591446094 is an abundant number, since it is smaller than the sum of its proper divisors (99470369465586).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81219591446094 is a wasteful number, since it uses less digits than its factorization.

81219591446094 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220722 (or 220716 counting only the distinct ones).

The product of its (nonzero) digits is 22394880, while the sum is 63.

The spelling of 81219591446094 in words is "eighty-one trillion, two hundred nineteen billion, five hundred ninety-one million, four hundred forty-six thousand, ninety-four".