51226116322565 has 4 divisors (see below), whose sum is σ = 61471339587084. Its totient is φ = 40980893058048.

The previous prime is 51226116322547. The next prime is 51226116322639. The reversal of 51226116322565 is 56522361162215.

51226116322565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 27458375525476 + 23767740797089 = 5240074^2 + 4875217^2 .

It is a cyclic number.

It is not a de Polignac number, because 51226116322565 - 2⁶ = 51226116322501 is a prime.

It is a super-2 number, since 2×51226116322565² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5122611632252 + ... + 5122611632261.

It is an arithmetic number, because the mean of its divisors is an integer number (15367834896771).

Almost surely, 2^{51226116322565} is an apocalyptic number.

It is an amenable number.

51226116322565 is a deficient number, since it is larger than the sum of its proper divisors (10245223264519).

51226116322565 is a wasteful number, since it uses less digits than its factorization.

51226116322565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10245223264518.

The product of its digits is 1296000, while the sum is 47.

The spelling of 51226116322565 in words is "fifty-one trillion, two hundred twenty-six billion, one hundred sixteen million, three hundred twenty-two thousand, five hundred sixty-five".