51325208405 has 4 divisors (see below), whose sum is σ = 61590250092. Its totient is φ = 41060166720.

The previous prime is 51325208401. The next prime is 51325208413. The reversal of 51325208405 is 50480252315.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5305519921 + 46019688484 = 72839^2 + 214522^2 .

It is not a de Polignac number, because 51325208405 - 2² = 51325208401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51325208401) 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, 5132520836 + ... + 5132520845.

It is an arithmetic number, because the mean of its divisors is an integer number (15397562523).

Almost surely, 2^51325208405 is an apocalyptic number.

It is an amenable number.

51325208405 is a deficient number, since it is larger than the sum of its proper divisors (10265041687).

51325208405 is a wasteful number, since it uses less digits than its factorization.

51325208405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10265041686.

The product of its (nonzero) digits is 48000, while the sum is 35.

The spelling of 51325208405 in words is "fifty-one billion, three hundred twenty-five million, two hundred eight thousand, four hundred five".