51905404811 has 4 divisors (see below), whose sum is σ = 55898128272. Its totient is φ = 47912681352.

The previous prime is 51905404777. The next prime is 51905404843. The reversal of 51905404811 is 11840450915.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11840450915 = 5 ⋅2368090183.

It is a cyclic number.

It is not a de Polignac number, because 51905404811 - 2²⁶ = 51838295947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51905404861) 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, 1996361711 + ... + 1996361736.

It is an arithmetic number, because the mean of its divisors is an integer number (13974532068).

Almost surely, 2^51905404811 is an apocalyptic number.

51905404811 is a deficient number, since it is larger than the sum of its proper divisors (3992723461).

51905404811 is a wasteful number, since it uses less digits than its factorization.

51905404811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3992723460.

The product of its (nonzero) digits is 28800, while the sum is 38.

The spelling of 51905404811 in words is "fifty-one billion, nine hundred five million, four hundred four thousand, eight hundred eleven".