51605340515587 has 2 divisors, whose sum is σ = 51605340515588. Its totient is φ = 51605340515586.

The previous prime is 51605340515579. The next prime is 51605340515633. The reversal of 51605340515587 is 78551504350615.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51605340515587 - 2³ = 51605340515579 is a prime.

It is a super-2 number, since 2×51605340515587² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51605340515527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25802670257793 + 25802670257794.

It is an arithmetic number, because the mean of its divisors is an integer number (25802670257794).

Almost surely, 2^{51605340515587} is an apocalyptic number.

51605340515587 is a deficient number, since it is larger than the sum of its proper divisors (1).

51605340515587 is an equidigital number, since it uses as much as digits as its factorization.

51605340515587 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12600000, while the sum is 55.

The spelling of 51605340515587 in words is "fifty-one trillion, six hundred five billion, three hundred forty million, five hundred fifteen thousand, five hundred eighty-seven".