81563229000 has 384 divisors, whose sum is σ = 318443374080. Its totient is φ = 18609408000.

The previous prime is 81563228969. The next prime is 81563229053. The reversal of 81563229000 is 92236518.

81563229000 is a `hidden beast` number, since 8 + 1 + 563 + 2 + 2 + 90 + 0 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1658769 + ... + 1707231.

It is an arithmetic number, because the mean of its divisors is an integer number (829279620).

Almost surely, 2^81563229000 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 81563229000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159221687040).

81563229000 is an abundant number, since it is smaller than the sum of its proper divisors (236880145080).

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

81563229000 is a wasteful number, since it uses less digits than its factorization.

81563229000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48518 (or 48501 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 81563229000 in words is "eighty-one billion, five hundred sixty-three million, two hundred twenty-nine thousand".