81985822350 has 24 divisors (see below), whose sum is σ = 203324839800. Its totient is φ = 21862885920.

The previous prime is 81985822319. The next prime is 81985822409. The reversal of 81985822350 is 5322858918.

It is a junction number, because it is equal to n+sod(n) for n = 81985822293 and 81985822302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 273285925 + ... + 273286224.

It is an arithmetic number, because the mean of its divisors is an integer number (8471868325).

Almost surely, 2^81985822350 is an apocalyptic number.

81985822350 is an abundant number, since it is smaller than the sum of its proper divisors (121339017450).

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

81985822350 is a wasteful number, since it uses less digits than its factorization.

81985822350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546572164 (or 546572159 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 51.

The spelling of 81985822350 in words is "eighty-one billion, nine hundred eighty-five million, eight hundred twenty-two thousand, three hundred fifty".