51801442663 has 4 divisors (see below), whose sum is σ = 51861747880. Its totient is φ = 51741137448.

The previous prime is 51801442657. The next prime is 51801442691. The reversal of 51801442663 is 36624410815.

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: 36624410815 = 5 ⋅7324882163.

It is a cyclic number.

It is not a de Polignac number, because 51801442663 - 2²⁵ = 51767888231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51801442613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30151320 + ... + 30153037.

It is an arithmetic number, because the mean of its divisors is an integer number (12965436970).

Almost surely, 2^51801442663 is an apocalyptic number.

51801442663 is a deficient number, since it is larger than the sum of its proper divisors (60305217).

51801442663 is an equidigital number, since it uses as much as digits as its factorization.

51801442663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60305216.

The product of its (nonzero) digits is 138240, while the sum is 40.

The spelling of 51801442663 in words is "fifty-one billion, eight hundred one million, four hundred forty-two thousand, six hundred sixty-three".