667224157 has 2 divisors, whose sum is σ = 667224158. Its totient is φ = 667224156.

The previous prime is 667224149. The next prime is 667224169. The reversal of 667224157 is 751422766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 393189241 + 274034916 = 19829^2 + 16554^2 .

It is a cyclic number.

It is not a de Polignac number, because 667224157 - 2³ = 667224149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667224137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333612078 + 333612079.

It is an arithmetic number, because the mean of its divisors is an integer number (333612079).

Almost surely, 2^667224157 is an apocalyptic number.

It is an amenable number.

667224157 is a deficient number, since it is larger than the sum of its proper divisors (1).

667224157 is an equidigital number, since it uses as much as digits as its factorization.

667224157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 40.

The square root of 667224157 is about 25830.6824725945. The cubic root of 667224157 is about 873.8239032238.

The spelling of 667224157 in words is "six hundred sixty-seven million, two hundred twenty-four thousand, one hundred fifty-seven".