81037810250 has 32 divisors (see below), whose sum is σ = 156933925200. Its totient is φ = 31297358400.

The previous prime is 81037810247. The next prime is 81037810261. The reversal of 81037810250 is 5201873018.

It can be written as a sum of positive squares in 8 ways, for example, as 3487256809 + 77550553441 = 59053^2 + 278479^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81037810250.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5581565 + ... + 5596064.

Almost surely, 2^81037810250 is an apocalyptic number.

81037810250 is a deficient number, since it is larger than the sum of its proper divisors (75896114950).

81037810250 is a wasteful number, since it uses less digits than its factorization.

81037810250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11177675 (or 11177665 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 35.

The spelling of 81037810250 in words is "eighty-one billion, thirty-seven million, eight hundred ten thousand, two hundred fifty".