51605340515647 has 4 divisors (see below), whose sum is σ = 51605522589760. Its totient is φ = 51605158441536.

The previous prime is 51605340515633. The next prime is 51605340515699. The reversal of 51605340515647 is 74651504350615.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51605340515647 is a prime.

It is a super-2 number, since 2×51605340515647² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51605340515594 and 51605340515603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51605340519647) 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, 90611247 + ... + 91178992.

It is an arithmetic number, because the mean of its divisors is an integer number (12901380647440).

Almost surely, 2^{51605340515647} is an apocalyptic number.

51605340515647 is a deficient number, since it is larger than the sum of its proper divisors (182074113).

51605340515647 is a wasteful number, since it uses less digits than its factorization.

51605340515647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182074112.

The product of its (nonzero) digits is 7560000, while the sum is 52.

The spelling of 51605340515647 in words is "fifty-one trillion, six hundred five billion, three hundred forty million, five hundred fifteen thousand, six hundred forty-seven".