869806460781 has 32 divisors (see below), whose sum is σ = 1306510350720. Its totient is φ = 571815407232.

The previous prime is 869806460777. The next prime is 869806460819. The reversal of 869806460781 is 187064608968.

869806460781 is a `hidden beast` number, since 8 + 6 + 98 + 0 + 6 + 460 + 7 + 81 = 666.

It is not a de Polignac number, because 869806460781 - 2² = 869806460777 is a prime.

It is a super-2 number, since 2×869806460781² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (869806460681) 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, 10687615 + ... + 10768691.

It is an arithmetic number, because the mean of its divisors is an integer number (40828448460).

Almost surely, 2^869806460781 is an apocalyptic number.

It is an amenable number.

869806460781 is a deficient number, since it is larger than the sum of its proper divisors (436703889939).

869806460781 is a wasteful number, since it uses less digits than its factorization.

869806460781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86602 (or 86596 counting only the distinct ones).

The product of its (nonzero) digits is 27869184, while the sum is 63.

The spelling of 869806460781 in words is "eight hundred sixty-nine billion, eight hundred six million, four hundred sixty thousand, seven hundred eighty-one".