81260745850 has 12 divisors (see below), whose sum is σ = 151144987374. Its totient is φ = 32504298320.

The previous prime is 81260745823. The next prime is 81260745887. The reversal of 81260745850 is 5854706218.

It can be written as a sum of positive squares in 3 ways, for example, as 69948083529 + 11312662321 = 264477^2 + 106361^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81260745850.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 812607409 + ... + 812607508.

Almost surely, 2^81260745850 is an apocalyptic number.

81260745850 is a deficient number, since it is larger than the sum of its proper divisors (69884241524).

81260745850 is a wasteful number, since it uses less digits than its factorization.

81260745850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1625214929 (or 1625214924 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 46.

The spelling of 81260745850 in words is "eighty-one billion, two hundred sixty million, seven hundred forty-five thousand, eight hundred fifty".