81370790083440 has 480 divisors, whose sum is σ = 331401048975360. Its totient is φ = 17621465241600.

The previous prime is 81370790083417. The next prime is 81370790083441. The reversal of 81370790083440 is 4438009707318.

81370790083440 is a `hidden beast` number, since 8 + 1 + 37 + 0 + 7 + 90 + 0 + 83 + 440 = 666.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81370790083441) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9555250 + ... + 15938769.

It is an arithmetic number, because the mean of its divisors is an integer number (690418852032).

Almost surely, 2^{81370790083440} is an apocalyptic number.

81370790083440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81370790083440 is an abundant number, since it is smaller than the sum of its proper divisors (250030258891920).

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

81370790083440 is a wasteful number, since it uses less digits than its factorization.

81370790083440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25494093 (or 25494084 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 54.

The spelling of 81370790083440 in words is "eighty-one trillion, three hundred seventy billion, seven hundred ninety million, eighty-three thousand, four hundred forty".