81457286450 has 48 divisors (see below), whose sum is σ = 158346043776. Its totient is φ = 31117363200.

The previous prime is 81457286441. The next prime is 81457286467. The reversal of 81457286450 is 5468275418.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 681899 + ... + 792401.

It is an arithmetic number, because the mean of its divisors is an integer number (3298875912).

Almost surely, 2^81457286450 is an apocalyptic number.

81457286450 is a deficient number, since it is larger than the sum of its proper divisors (76888757326).

81457286450 is a wasteful number, since it uses less digits than its factorization.

81457286450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111179 (or 111174 counting only the distinct ones).

The product of its (nonzero) digits is 2150400, while the sum is 50.

The spelling of 81457286450 in words is "eighty-one billion, four hundred fifty-seven million, two hundred eighty-six thousand, four hundred fifty".