6686148731 has 2 divisors, whose sum is σ = 6686148732. Its totient is φ = 6686148730.

The previous prime is 6686148713. The next prime is 6686148823. The reversal of 6686148731 is 1378416866.

Together with previous prime (6686148713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6686148731 - 2¹⁰ = 6686147707 is a prime.

It is a super-2 number, since 2×6686148731² = 89409169706105820722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6686148731.

It is not a weakly prime, because it can be changed into another prime (6686148031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3343074365 + 3343074366.

It is an arithmetic number, because the mean of its divisors is an integer number (3343074366).

Almost surely, 2^6686148731 is an apocalyptic number.

6686148731 is a deficient number, since it is larger than the sum of its proper divisors (1).

6686148731 is an equidigital number, since it uses as much as digits as its factorization.

6686148731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 50.

The square root of 6686148731 is about 81768.8738518515. The cubic root of 6686148731 is about 1883.9036072462.

The spelling of 6686148731 in words is "six billion, six hundred eighty-six million, one hundred forty-eight thousand, seven hundred thirty-one".