81033578496 has 768 divisors, whose sum is σ = 288943200000. Its totient is φ = 22167945216.

The previous prime is 81033578467. The next prime is 81033578519. The reversal of 81033578496 is 69487533018.

81033578496 is a `hidden beast` number, since 81 + 0 + 3 + 3 + 5 + 78 + 496 = 666.

It is a tau number, because it is divible by the number of its divisors (768).

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 232187730 + ... + 232188078.

It is an arithmetic number, because the mean of its divisors is an integer number (376228125).

Almost surely, 2^81033578496 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 81033578496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144471600000).

81033578496 is an abundant number, since it is smaller than the sum of its proper divisors (207909621504).

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

81033578496 is a wasteful number, since it uses less digits than its factorization.

81033578496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429 (or 403 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 54.

The spelling of 81033578496 in words is "eighty-one billion, thirty-three million, five hundred seventy-eight thousand, four hundred ninety-six".