667561405211 has 2 divisors, whose sum is σ = 667561405212. Its totient is φ = 667561405210.

The previous prime is 667561405169. The next prime is 667561405237. The reversal of 667561405211 is 112504165766.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667561405211 - 2²² = 667557210907 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (667561405111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333780702605 + 333780702606.

It is an arithmetic number, because the mean of its divisors is an integer number (333780702606).

Almost surely, 2^667561405211 is an apocalyptic number.

667561405211 is a deficient number, since it is larger than the sum of its proper divisors (1).

667561405211 is an equidigital number, since it uses as much as digits as its factorization.

667561405211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 667561405211 in words is "six hundred sixty-seven billion, five hundred sixty-one million, four hundred five thousand, two hundred eleven".