81039112002250 has 32 divisors (see below), whose sum is σ = 153409770717840. Its totient is φ = 32051424064000.

The previous prime is 81039112002223. The next prime is 81039112002263. The reversal of 81039112002250 is 5220021193018.

It can be written as a sum of positive squares in 8 ways, for example, as 7828003792449 + 73211108209801 = 2797857^2 + 8556349^2 .

It is a super-2 number, since 2×81039112002250² (a number of 29 digits) contains 22 as substring.

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, 1821081391 + ... + 1821125890.

Almost surely, 2^{81039112002250} is an apocalyptic number.

81039112002250 is a deficient number, since it is larger than the sum of its proper divisors (72370658715590).

81039112002250 is a wasteful number, since it uses less digits than its factorization.

81039112002250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3642207387 (or 3642207377 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

Adding to 81039112002250 its reverse (5220021193018), we get a palindrome (86259133195268).

The spelling of 81039112002250 in words is "eighty-one trillion, thirty-nine billion, one hundred twelve million, two thousand, two hundred fifty".