81259471780403 has 24 divisors (see below), whose sum is σ = 100087339338000. Its totient is φ = 65553438440448.

The previous prime is 81259471780343. The next prime is 81259471780441. The reversal of 81259471780403 is 30408717495218.

It is a happy number.

It is not a de Polignac number, because 81259471780403 - 2⁸ = 81259471780147 is a prime.

It is a super-2 number, since 2×81259471780403² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81259471780463) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 239775488 + ... + 240114146.

It is an arithmetic number, because the mean of its divisors is an integer number (4170305805750).

Almost surely, 2^{81259471780403} is an apocalyptic number.

81259471780403 is a deficient number, since it is larger than the sum of its proper divisors (18827867557597).

81259471780403 is a wasteful number, since it uses less digits than its factorization.

81259471780403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626739 (or 626732 counting only the distinct ones).

The product of its (nonzero) digits is 13547520, while the sum is 59.

The spelling of 81259471780403 in words is "eighty-one trillion, two hundred fifty-nine billion, four hundred seventy-one million, seven hundred eighty thousand, four hundred three".