81876243456 has 396 divisors, whose sum is σ = 287007937632. Its totient is φ = 22373277696.

The previous prime is 81876243437. The next prime is 81876243461. The reversal of 81876243456 is 65434267818.

It is a happy number.

81876243456 is a `hidden beast` number, since 8 + 1 + 8 + 7 + 624 + 3 + 4 + 5 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 10382491 + ... + 10390373.

Almost surely, 2^81876243456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81876243456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143503968816).

81876243456 is an abundant number, since it is smaller than the sum of its proper divisors (205131694176).

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

81876243456 is a wasteful number, since it uses less digits than its factorization.

81876243456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7946 (or 7918 counting only the distinct ones).

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

The spelling of 81876243456 in words is "eighty-one billion, eight hundred seventy-six million, two hundred forty-three thousand, four hundred fifty-six".