667212111187 has 2 divisors, whose sum is σ = 667212111188. Its totient is φ = 667212111186.

The previous prime is 667212111179. The next prime is 667212111197. The reversal of 667212111187 is 781111212766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 667212111187 - 2³ = 667212111179 is a prime.

It is a super-2 number, since 2×667212111187² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (667212111127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333606055593 + 333606055594.

It is an arithmetic number, because the mean of its divisors is an integer number (333606055594).

Almost surely, 2^667212111187 is an apocalyptic number.

667212111187 is a deficient number, since it is larger than the sum of its proper divisors (1).

667212111187 is an equidigital number, since it uses as much as digits as its factorization.

667212111187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 43.

The spelling of 667212111187 in words is "six hundred sixty-seven billion, two hundred twelve million, one hundred eleven thousand, one hundred eighty-seven".