667233401 has 2 divisors, whose sum is σ = 667233402. Its totient is φ = 667233400.

The previous prime is 667233389. The next prime is 667233403. The reversal of 667233401 is 104332766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 666672400 + 561001 = 25820^2 + 749^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667233401 is a prime.

It is a super-2 number, since 2×667233401² = 890400822820053602, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 667233403, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (667233403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333616700 + 333616701.

It is an arithmetic number, because the mean of its divisors is an integer number (333616701).

Almost surely, 2^667233401 is an apocalyptic number.

It is an amenable number.

667233401 is a deficient number, since it is larger than the sum of its proper divisors (1).

667233401 is an equidigital number, since it uses as much as digits as its factorization.

667233401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 667233401 is about 25830.8614064649. The cubic root of 667233401 is about 873.8279386447.

The spelling of 667233401 in words is "six hundred sixty-seven million, two hundred thirty-three thousand, four hundred one".