811580660567 has 4 divisors (see below), whose sum is σ = 819460084560. Its totient is φ = 803701236576.

The previous prime is 811580660521. The next prime is 811580660587. The reversal of 811580660567 is 765066085118.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 811580660567 - 2²⁰ = 811579611991 is a prime.

It is a super-2 number, since 2×811580660567² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811580660587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3939711842 + ... + 3939712047.

It is an arithmetic number, because the mean of its divisors is an integer number (204865021140).

Almost surely, 2^811580660567 is an apocalyptic number.

811580660567 is a deficient number, since it is larger than the sum of its proper divisors (7879423993).

811580660567 is a wasteful number, since it uses less digits than its factorization.

811580660567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7879423992.

The product of its (nonzero) digits is 2419200, while the sum is 53.

The spelling of 811580660567 in words is "eight hundred eleven billion, five hundred eighty million, six hundred sixty thousand, five hundred sixty-seven".