51504340549 has 4 divisors (see below), whose sum is σ = 51511944960. Its totient is φ = 51496736140.

The previous prime is 51504340529. The next prime is 51504340561. The reversal of 51504340549 is 94504340515.

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 a de Polignac number, because none of the positive numbers 2^k-51504340549 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 (51504340529) 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, 3792037 + ... + 3805594.

It is an arithmetic number, because the mean of its divisors is an integer number (12877986240).

Almost surely, 2^51504340549 is an apocalyptic number.

It is an amenable number.

51504340549 is a deficient number, since it is larger than the sum of its proper divisors (7604411).

51504340549 is an equidigital number, since it uses as much as digits as its factorization.

51504340549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7604410.

The product of its (nonzero) digits is 216000, while the sum is 40.

The spelling of 51504340549 in words is "fifty-one billion, five hundred four million, three hundred forty thousand, five hundred forty-nine".