811204638185 has 16 divisors (see below), whose sum is σ = 974247270912. Its totient is φ = 648429446400.

The previous prime is 811204638103. The next prime is 811204638203. The reversal of 811204638185 is 581836402118.

It is a de Polignac number, because none of the positive numbers 2^k-811204638185 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42172520 + ... + 42191750.

It is an arithmetic number, because the mean of its divisors is an integer number (60890454432).

Almost surely, 2^811204638185 is an apocalyptic number.

It is an amenable number.

811204638185 is a deficient number, since it is larger than the sum of its proper divisors (163042632727).

811204638185 is a wasteful number, since it uses less digits than its factorization.

811204638185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25744.

The product of its (nonzero) digits is 368640, while the sum is 47.

The spelling of 811204638185 in words is "eight hundred eleven billion, two hundred four million, six hundred thirty-eight thousand, one hundred eighty-five".