81194332132440 has 48 divisors (see below), whose sum is σ = 263881579431600. Its totient is φ = 21651821901888.

The previous prime is 81194332132421. The next prime is 81194332132477. The reversal of 81194332132440 is 4423123349118.

81194332132440 is a `hidden beast` number, since 8 + 1 + 1 + 9 + 43 + 32 + 132 + 440 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 112769905380 + ... + 112769906099.

It is an arithmetic number, because the mean of its divisors is an integer number (5497532904825).

Almost surely, 2^{81194332132440} is an apocalyptic number.

It is an amenable number.

81194332132440 is an abundant number, since it is smaller than the sum of its proper divisors (182687247299160).

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

81194332132440 is a wasteful number, since it uses less digits than its factorization.

81194332132440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225539811496 (or 225539811489 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The spelling of 81194332132440 in words is "eighty-one trillion, one hundred ninety-four billion, three hundred thirty-two million, one hundred thirty-two thousand, four hundred forty".