667244771 has 2 divisors, whose sum is σ = 667244772. Its totient is φ = 667244770.

The previous prime is 667244737. The next prime is 667244777. The reversal of 667244771 is 177442766.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667244771 is a prime.

It is not a weakly prime, because it can be changed into another prime (667244777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333622385 + 333622386.

It is an arithmetic number, because the mean of its divisors is an integer number (333622386).

Almost surely, 2^667244771 is an apocalyptic number.

667244771 is a deficient number, since it is larger than the sum of its proper divisors (1).

667244771 is an equidigital number, since it uses as much as digits as its factorization.

667244771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 395136, while the sum is 44.

The square root of 667244771 is about 25831.0814911029. The cubic root of 667244771 is about 873.8329021089.

The spelling of 667244771 in words is "six hundred sixty-seven million, two hundred forty-four thousand, seven hundred seventy-one".