7687545857 has 2 divisors, whose sum is σ = 7687545858. Its totient is φ = 7687545856.

The previous prime is 7687545841. The next prime is 7687545883. The reversal of 7687545857 is 7585457867.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5983177201 + 1704368656 = 77351^2 + 41284^2 .

It is a cyclic number.

It is not a de Polignac number, because 7687545857 - 2⁴ = 7687545841 is a prime.

It is a super-2 number, since 2×7687545857² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7687545857.

It is not a weakly prime, because it can be changed into another prime (7687545157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3843772928 + 3843772929.

It is an arithmetic number, because the mean of its divisors is an integer number (3843772929).

Almost surely, 2^7687545857 is an apocalyptic number.

It is an amenable number.

7687545857 is a deficient number, since it is larger than the sum of its proper divisors (1).

7687545857 is an equidigital number, since it uses as much as digits as its factorization.

7687545857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 65856000, while the sum is 62.

The square root of 7687545857 is about 87678.6510902169. The cubic root of 7687545857 is about 1973.6156175231.

The spelling of 7687545857 in words is "seven billion, six hundred eighty-seven million, five hundred forty-five thousand, eight hundred fifty-seven".