156664213 has 2 divisors, whose sum is σ = 156664214. Its totient is φ = 156664212.

The previous prime is 156664181. The next prime is 156664273. The reversal of 156664213 is 312466651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78818884 + 77845329 = 8878^2 + 8823^2 .

It is a cyclic number.

It is not a de Polignac number, because 156664213 - 2⁵ = 156664181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156664273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78332106 + 78332107.

It is an arithmetic number, because the mean of its divisors is an integer number (78332107).

Almost surely, 2^156664213 is an apocalyptic number.

It is an amenable number.

156664213 is a deficient number, since it is larger than the sum of its proper divisors (1).

156664213 is an equidigital number, since it uses as much as digits as its factorization.

156664213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 34.

The square root of 156664213 is about 12516.5575538964. The cubic root of 156664213 is about 539.0841964797.

The spelling of 156664213 in words is "one hundred fifty-six million, six hundred sixty-four thousand, two hundred thirteen".