2081538667440 has 400 divisors, whose sum is σ = 7441953871968. Its totient is φ = 538980728832.

The previous prime is 2081538667421. The next prime is 2081538667457. The reversal of 2081538667440 is 447668351802.

It is a happy number.

2081538667440 is a `hidden beast` number, since 2 + 0 + 8 + 1 + 538 + 6 + 67 + 4 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 33282439 + ... + 33344921.

Almost surely, 2^{2081538667440} is an apocalyptic number.

2081538667440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2081538667440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3720976935984).

2081538667440 is an abundant number, since it is smaller than the sum of its proper divisors (5360415204528).

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

2081538667440 is a wasteful number, since it uses less digits than its factorization.

2081538667440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62658 (or 62643 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 54.

The spelling of 2081538667440 in words is "two trillion, eighty-one billion, five hundred thirty-eight million, six hundred sixty-seven thousand, four hundred forty".