811282768261 has 24 divisors (see below), whose sum is σ = 952512397056. Its totient is φ = 688936772160.

The previous prime is 811282768253. The next prime is 811282768271. The reversal of 811282768261 is 162867282118.

It is not a de Polignac number, because 811282768261 - 2³ = 811282768253 is a prime.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 811282768199 and 811282768208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811282768271) 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, 3792225 + ... + 4000441.

It is an arithmetic number, because the mean of its divisors is an integer number (39688016544).

Almost surely, 2^811282768261 is an apocalyptic number.

It is an amenable number.

811282768261 is a deficient number, since it is larger than the sum of its proper divisors (141229628795).

811282768261 is a wasteful number, since it uses less digits than its factorization.

811282768261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208969 (or 208962 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 52.

The spelling of 811282768261 in words is "eight hundred eleven billion, two hundred eighty-two million, seven hundred sixty-eight thousand, two hundred sixty-one".