51564200123 has 4 divisors (see below), whose sum is σ = 51564655128. Its totient is φ = 51563745120.

The previous prime is 51564200113. The next prime is 51564200141. The reversal of 51564200123 is 32100246515.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 51564200123 - 2¹⁸ = 51563937979 is a prime.

It is a super-3 number, since 3×51564200123³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51564200113) 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, 92915 + ... + 334307.

It is an arithmetic number, because the mean of its divisors is an integer number (12891163782).

Almost surely, 2^51564200123 is an apocalyptic number.

51564200123 is a deficient number, since it is larger than the sum of its proper divisors (455005).

51564200123 is a wasteful number, since it uses less digits than its factorization.

51564200123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455004.

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 51564200123 its reverse (32100246515), we get a palindrome (83664446638).

The spelling of 51564200123 in words is "fifty-one billion, five hundred sixty-four million, two hundred thousand, one hundred twenty-three".