811218415051 has 32 divisors (see below), whose sum is σ = 896928215040. Its totient is φ = 727570099200.

The previous prime is 811218415027. The next prime is 811218415061. The reversal of 811218415051 is 150514812118.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 811218415051 - 2¹¹ = 811218413003 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 811218415051.

It is not an unprimeable number, because it can be changed into a prime (811218415061) 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, 461180710 + ... + 461182468.

It is an arithmetic number, because the mean of its divisors is an integer number (28029006720).

Almost surely, 2^811218415051 is an apocalyptic number.

811218415051 is a deficient number, since it is larger than the sum of its proper divisors (85709799989).

811218415051 is a wasteful number, since it uses less digits than its factorization.

811218415051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3387.

The product of its (nonzero) digits is 12800, while the sum is 37.

The spelling of 811218415051 in words is "eight hundred eleven billion, two hundred eighteen million, four hundred fifteen thousand, fifty-one".