661110167 has 2 divisors, whose sum is σ = 661110168. Its totient is φ = 661110166.

The previous prime is 661110143. The next prime is 661110209. The reversal of 661110167 is 761011166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 661110167 - 2²⁴ = 644332951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661115167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330555083 + 330555084.

It is an arithmetic number, because the mean of its divisors is an integer number (330555084).

Almost surely, 2^661110167 is an apocalyptic number.

661110167 is a deficient number, since it is larger than the sum of its proper divisors (1).

661110167 is an equidigital number, since it uses as much as digits as its factorization.

661110167 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 661110167 is about 25712.0626749392. The cubic root of 661110167 is about 871.1466656776.

Subtracting 661110167 from its reverse (761011166), we obtain a palindrome (99900999).

The spelling of 661110167 in words is "six hundred sixty-one million, one hundred ten thousand, one hundred sixty-seven".