6670407391 has 2 divisors, whose sum is σ = 6670407392. Its totient is φ = 6670407390.

The previous prime is 6670407313. The next prime is 6670407413. The reversal of 6670407391 is 1937040766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6670407391 - 2²¹ = 6668310239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6670407091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3335203695 + 3335203696.

It is an arithmetic number, because the mean of its divisors is an integer number (3335203696).

Almost surely, 2^6670407391 is an apocalyptic number.

6670407391 is a deficient number, since it is larger than the sum of its proper divisors (1).

6670407391 is an equidigital number, since it uses as much as digits as its factorization.

6670407391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 190512, while the sum is 43.

The square root of 6670407391 is about 81672.5620450344. The cubic root of 6670407391 is about 1882.4240075801.

The spelling of 6670407391 in words is "six billion, six hundred seventy million, four hundred seven thousand, three hundred ninety-one".