51544405111 has 4 divisors (see below), whose sum is σ = 51613040224. Its totient is φ = 51475770000.

The previous prime is 51544405097. The next prime is 51544405117. The reversal of 51544405111 is 11150444515.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51544405111 - 2¹¹ = 51544403063 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 (51544405117) 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, 34316430 + ... + 34317931.

It is an arithmetic number, because the mean of its divisors is an integer number (12903260056).

Almost surely, 2^51544405111 is an apocalyptic number.

51544405111 is a deficient number, since it is larger than the sum of its proper divisors (68635113).

51544405111 is an equidigital number, since it uses as much as digits as its factorization.

51544405111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68635112.

The product of its (nonzero) digits is 8000, while the sum is 31.

Adding to 51544405111 its reverse (11150444515), we get a palindrome (62694849626).

The spelling of 51544405111 in words is "fifty-one billion, five hundred forty-four million, four hundred five thousand, one hundred eleven".