56686515287 has 2 divisors, whose sum is σ = 56686515288. Its totient is φ = 56686515286.

The previous prime is 56686515271. The next prime is 56686515341. The reversal of 56686515287 is 78251568665.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56686515287 - 2⁴ = 56686515271 is a prime.

It is a super-2 number, since 2×56686515287² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56686515217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28343257643 + 28343257644.

It is an arithmetic number, because the mean of its divisors is an integer number (28343257644).

Almost surely, 2^56686515287 is an apocalyptic number.

56686515287 is a deficient number, since it is larger than the sum of its proper divisors (1).

56686515287 is an equidigital number, since it uses as much as digits as its factorization.

56686515287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192000, while the sum is 59.

The spelling of 56686515287 in words is "fifty-six billion, six hundred eighty-six million, five hundred fifteen thousand, two hundred eighty-seven".