51243005525 has 12 divisors (see below), whose sum is σ = 64103643012. Its totient is φ = 40631619840.

The previous prime is 51243005449. The next prime is 51243005551. The reversal of 51243005525 is 52550034215.

It can be written as a sum of positive squares in 6 ways, for example, as 301161316 + 50941844209 = 17354^2 + 225703^2 .

It is not a de Polignac number, because 51243005525 - 2¹⁸ = 51242743381 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51243005491 and 51243005500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9066734 + ... + 9072383.

It is an arithmetic number, because the mean of its divisors is an integer number (5341970251).

Almost surely, 2^51243005525 is an apocalyptic number.

It is an amenable number.

51243005525 is a deficient number, since it is larger than the sum of its proper divisors (12860637487).

51243005525 is a wasteful number, since it uses less digits than its factorization.

51243005525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18139240 (or 18139235 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 32.

The spelling of 51243005525 in words is "fifty-one billion, two hundred forty-three million, five thousand, five hundred twenty-five".