667212601667 has 2 divisors, whose sum is σ = 667212601668. Its totient is φ = 667212601666.

The previous prime is 667212601621. The next prime is 667212601721. The reversal of 667212601667 is 766106212766.

667212601667 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 667212601667 - 2⁶ = 667212601603 is a prime.

It is a super-2 number, since 2×667212601667² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (667212603667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333606300833 + 333606300834.

It is an arithmetic number, because the mean of its divisors is an integer number (333606300834).

Almost surely, 2^667212601667 is an apocalyptic number.

667212601667 is a deficient number, since it is larger than the sum of its proper divisors (1).

667212601667 is an equidigital number, since it uses as much as digits as its factorization.

667212601667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1524096, while the sum is 50.

The spelling of 667212601667 in words is "six hundred sixty-seven billion, two hundred twelve million, six hundred one thousand, six hundred sixty-seven".