81346170240 has 128 divisors (see below), whose sum is σ = 288101080800. Its totient is φ = 21692307456.

The previous prime is 81346170193. The next prime is 81346170251. The reversal of 81346170240 is 4207164318.

81346170240 is a `hidden beast` number, since 8 + 1 + 34 + 617 + 0 + 2 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 81346170195 and 81346170204.

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, 2336487 + ... + 2371046.

Almost surely, 2^81346170240 is an apocalyptic number.

81346170240 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81346170240 is an abundant number, since it is smaller than the sum of its proper divisors (206754910560).

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

81346170240 is a wasteful number, since it uses less digits than its factorization.

81346170240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4707561 (or 4707543 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The spelling of 81346170240 in words is "eighty-one billion, three hundred forty-six million, one hundred seventy thousand, two hundred forty".