161656207 has 2 divisors, whose sum is σ = 161656208. Its totient is φ = 161656206.

The previous prime is 161656189. The next prime is 161656267. The reversal of 161656207 is 702656161.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (702656161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161656207 - 2¹⁵ = 161623439 is a prime.

It is a super-2 number, since 2×161656207² = 52265458523253698, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161656267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80828103 + 80828104.

It is an arithmetic number, because the mean of its divisors is an integer number (80828104).

Almost surely, 2^161656207 is an apocalyptic number.

161656207 is a deficient number, since it is larger than the sum of its proper divisors (1).

161656207 is an equidigital number, since it uses as much as digits as its factorization.

161656207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 161656207 is about 12714.4094239567. The cubic root of 161656207 is about 544.7502792203.

The spelling of 161656207 in words is "one hundred sixty-one million, six hundred fifty-six thousand, two hundred seven".