81850699392 has 512 divisors, whose sum is σ = 277948661760. Its totient is φ = 20727705600.

The previous prime is 81850699379. The next prime is 81850699423. The reversal of 81850699392 is 29399605818.

It is a happy number.

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, 266614503 + ... + 266614809.

It is an arithmetic number, because the mean of its divisors is an integer number (542868480).

Almost surely, 2^81850699392 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 81850699392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138974330880).

81850699392 is an abundant number, since it is smaller than the sum of its proper divisors (196097962368).

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

81850699392 is a wasteful number, since it uses less digits than its factorization.

81850699392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540 (or 528 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 60.

The spelling of 81850699392 in words is "eighty-one billion, eight hundred fifty million, six hundred ninety-nine thousand, three hundred ninety-two".