81841256253 has 32 divisors (see below), whose sum is σ = 123231715200. Its totient is φ = 53673637248.

The previous prime is 81841256249. The next prime is 81841256257. The reversal of 81841256253 is 35265214818.

81841256253 is a `hidden beast` number, since 8 + 1 + 8 + 4 + 12 + 5 + 625 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (81841256249) and next prime (81841256257).

It is not a de Polignac number, because 81841256253 - 2² = 81841256249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81841256199 and 81841256208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81841256257) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 386950 + ... + 559832.

It is an arithmetic number, because the mean of its divisors is an integer number (3850991100).

Almost surely, 2^81841256253 is an apocalyptic number.

It is an amenable number.

81841256253 is a deficient number, since it is larger than the sum of its proper divisors (41390458947).

81841256253 is a wasteful number, since it uses less digits than its factorization.

81841256253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173178 (or 173172 counting only the distinct ones).

The product of its digits is 460800, while the sum is 45.

The spelling of 81841256253 in words is "eighty-one billion, eight hundred forty-one million, two hundred fifty-six thousand, two hundred fifty-three".