667020407 has 2 divisors, whose sum is σ = 667020408. Its totient is φ = 667020406.

The previous prime is 667020353. The next prime is 667020413. The reversal of 667020407 is 704020766.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667020407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667020307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333510203 + 333510204.

It is an arithmetic number, because the mean of its divisors is an integer number (333510204).

Almost surely, 2^667020407 is an apocalyptic number.

667020407 is a deficient number, since it is larger than the sum of its proper divisors (1).

667020407 is an equidigital number, since it uses as much as digits as its factorization.

667020407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 667020407 is about 25826.7382183659. The cubic root of 667020407 is about 873.7349477385.

The spelling of 667020407 in words is "six hundred sixty-seven million, twenty thousand, four hundred seven".