81256440703753 has 16 divisors (see below), whose sum is σ = 94206591755136. Its totient is φ = 68645798081280.

The previous prime is 81256440703709. The next prime is 81256440703817. The reversal of 81256440703753 is 35730704465218.

It is not a de Polignac number, because 81256440703753 - 2⁴⁵ = 46072068614921 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81256440703694 and 81256440703703.

It is not an unprimeable number, because it can be changed into a prime (81256440701753) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165855376 + ... + 166344577.

It is an arithmetic number, because the mean of its divisors is an integer number (5887911984696).

Almost surely, 2^{81256440703753} is an apocalyptic number.

81256440703753 is a gapful number since it is divisible by the number (83) formed by its first and last digit.

It is an amenable number.

81256440703753 is a deficient number, since it is larger than the sum of its proper divisors (12950151051383).

81256440703753 is a wasteful number, since it uses less digits than its factorization.

81256440703753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332200464.

The product of its (nonzero) digits is 16934400, while the sum is 55.

The spelling of 81256440703753 in words is "eighty-one trillion, two hundred fifty-six billion, four hundred forty million, seven hundred three thousand, seven hundred fifty-three".