667740407 has 2 divisors, whose sum is σ = 667740408. Its totient is φ = 667740406.

The previous prime is 667740379. The next prime is 667740419. The reversal of 667740407 is 704047766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667740407 - 2¹⁶ = 667674871 is a prime.

It is a super-2 number, since 2×667740407² = 891754502281051298, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667740707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333870203 + 333870204.

It is an arithmetic number, because the mean of its divisors is an integer number (333870204).

Almost surely, 2^667740407 is an apocalyptic number.

667740407 is a deficient number, since it is larger than the sum of its proper divisors (1).

667740407 is an equidigital number, since it uses as much as digits as its factorization.

667740407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 197568, while the sum is 41.

The square root of 667740407 is about 25840.6735012848. The cubic root of 667740407 is about 874.0492124593.

The spelling of 667740407 in words is "six hundred sixty-seven million, seven hundred forty thousand, four hundred seven".