667251943 has 2 divisors, whose sum is σ = 667251944. Its totient is φ = 667251942.

The previous prime is 667251931. The next prime is 667251947. The reversal of 667251943 is 349152766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667251943 - 2¹³ = 667243751 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 667251943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667251947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333625971 + 333625972.

It is an arithmetic number, because the mean of its divisors is an integer number (333625972).

Almost surely, 2^667251943 is an apocalyptic number.

667251943 is a deficient number, since it is larger than the sum of its proper divisors (1).

667251943 is an equidigital number, since it uses as much as digits as its factorization.

667251943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 43.

The square root of 667251943 is about 25831.2203157342. The cubic root of 667251943 is about 873.8360329475.

The spelling of 667251943 in words is "six hundred sixty-seven million, two hundred fifty-one thousand, nine hundred forty-three".