245686686887 has 4 divisors (see below), whose sum is σ = 246169372440. Its totient is φ = 245204001336.

The previous prime is 245686686863. The next prime is 245686686893. The reversal of 245686686887 is 788686686542.

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

It is a cyclic number.

It is not a de Polignac number, because 245686686887 - 2⁸ = 245686686631 is a prime.

It is a super-2 number, since 2×245686686887² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245686682887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241342013 + ... + 241343030.

It is an arithmetic number, because the mean of its divisors is an integer number (61542343110).

Almost surely, 2^245686686887 is an apocalyptic number.

245686686887 is a deficient number, since it is larger than the sum of its proper divisors (482685553).

245686686887 is an equidigital number, since it uses as much as digits as its factorization.

245686686887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482685552.

The product of its digits is 1486356480, while the sum is 74.

The spelling of 245686686887 in words is "two hundred forty-five billion, six hundred eighty-six million, six hundred eighty-six thousand, eight hundred eighty-seven".