51214518811 has 4 divisors (see below), whose sum is σ = 52304189472. Its totient is φ = 50124848152.

The previous prime is 51214518799. The next prime is 51214518851. The reversal of 51214518811 is 11881541215.

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: 11881541215 = 5 ⋅2376308243.

It is a cyclic number.

It is not a de Polignac number, because 51214518811 - 2⁵ = 51214518779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51214518851) 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, 544835260 + ... + 544835353.

It is an arithmetic number, because the mean of its divisors is an integer number (13076047368).

Almost surely, 2^51214518811 is an apocalyptic number.

51214518811 is a deficient number, since it is larger than the sum of its proper divisors (1089670661).

51214518811 is a wasteful number, since it uses less digits than its factorization.

51214518811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089670660.

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

It can be divided in two parts, 51214 and 518811, that added together give a square (570025 = 755²).

The spelling of 51214518811 in words is "fifty-one billion, two hundred fourteen million, five hundred eighteen thousand, eight hundred eleven".