51565745253 has 8 divisors (see below), whose sum is σ = 75004720416. Its totient is φ = 31251966800.

The previous prime is 51565745249. The next prime is 51565745291. The reversal of 51565745253 is 35254756515.

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

It is a cyclic number.

It is not a de Polignac number, because 51565745253 - 2² = 51565745249 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51565745213) 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, 781299138 + ... + 781299203.

It is an arithmetic number, because the mean of its divisors is an integer number (9375590052).

Almost surely, 2^51565745253 is an apocalyptic number.

It is an amenable number.

51565745253 is a deficient number, since it is larger than the sum of its proper divisors (23438975163).

51565745253 is a wasteful number, since it uses less digits than its factorization.

51565745253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562598355.

The product of its digits is 3150000, while the sum is 48.

The spelling of 51565745253 in words is "fifty-one billion, five hundred sixty-five million, seven hundred forty-five thousand, two hundred fifty-three".