51345565564237 has 8 divisors (see below), whose sum is σ = 59787828366336. Its totient is φ = 43180098263952.

The previous prime is 51345565564219. The next prime is 51345565564283. The reversal of 51345565564237 is 73246556554315.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51345565564237 is a prime.

It is a super-2 number, since 2×51345565564237² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51345565565237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69198875053 + ... + 69198875794.

It is an arithmetic number, because the mean of its divisors is an integer number (7473478545792).

Almost surely, 2^{51345565564237} is an apocalyptic number.

It is an amenable number.

51345565564237 is a deficient number, since it is larger than the sum of its proper divisors (8442262802099).

51345565564237 is a wasteful number, since it uses less digits than its factorization.

51345565564237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138397750907.

The product of its digits is 226800000, while the sum is 61.

The spelling of 51345565564237 in words is "fifty-one trillion, three hundred forty-five billion, five hundred sixty-five million, five hundred sixty-four thousand, two hundred thirty-seven".