81828271263 has 16 divisors (see below), whose sum is σ = 112172350176. Its totient is φ = 53021324160.

The previous prime is 81828271249. The next prime is 81828271267. The reversal of 81828271263 is 36217282818.

It is not a de Polignac number, because 81828271263 - 2⁶ = 81828271199 is a prime.

It is a super-2 number, since 2×81828271263² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81828271267) 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, 287256 + ... + 496157.

It is an arithmetic number, because the mean of its divisors is an integer number (7010771886).

Almost surely, 2^81828271263 is an apocalyptic number.

81828271263 is a deficient number, since it is larger than the sum of its proper divisors (30344078913).

81828271263 is a wasteful number, since it uses less digits than its factorization.

81828271263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784394.

The product of its digits is 516096, while the sum is 48.

The spelling of 81828271263 in words is "eighty-one billion, eight hundred twenty-eight million, two hundred seventy-one thousand, two hundred sixty-three".