51544402213 has 4 divisors (see below), whose sum is σ = 51596839008. Its totient is φ = 51491965420.

The previous prime is 51544402201. The next prime is 51544402219. The reversal of 51544402213 is 31220444515.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51544402213 - 2²⁹ = 51007531301 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 (51544402219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26216923 + ... + 26218888.

It is an arithmetic number, because the mean of its divisors is an integer number (12899209752).

Almost surely, 2^51544402213 is an apocalyptic number.

It is an amenable number.

51544402213 is a deficient number, since it is larger than the sum of its proper divisors (52436795).

51544402213 is an equidigital number, since it uses as much as digits as its factorization.

51544402213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52436794.

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 51544402213 its reverse (31220444515), we get a palindrome (82764846728).

The spelling of 51544402213 in words is "fifty-one billion, five hundred forty-four million, four hundred two thousand, two hundred thirteen".