51505403051 has 4 divisors (see below), whose sum is σ = 51961203192. Its totient is φ = 51049602912.

The previous prime is 51505403041. The next prime is 51505403069. The reversal of 51505403051 is 15030450515.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51505403051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51505403041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 227899901 + ... + 227900126.

It is an arithmetic number, because the mean of its divisors is an integer number (12990300798).

Almost surely, 2^51505403051 is an apocalyptic number.

51505403051 is a deficient number, since it is larger than the sum of its proper divisors (455800141).

51505403051 is a wasteful number, since it uses less digits than its factorization.

51505403051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455800140.

The product of its (nonzero) digits is 7500, while the sum is 29.

Adding to 51505403051 its reverse (15030450515), we get a palindrome (66535853566).

The spelling of 51505403051 in words is "fifty-one billion, five hundred five million, four hundred three thousand, fifty-one".