161606207 has 4 divisors (see below), whose sum is σ = 184692816. Its totient is φ = 138519600.

The previous prime is 161606177. The next prime is 161606209. The reversal of 161606207 is 702606161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 702606161 = 59 ⋅11908579.

It is a cyclic number.

It is not a de Polignac number, because 161606207 - 2⁶ = 161606143 is a prime.

It is a super-2 number, since 2×161606207² = 52233132281853698, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161606207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161606209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11543294 + ... + 11543307.

It is an arithmetic number, because the mean of its divisors is an integer number (46173204).

Almost surely, 2^161606207 is an apocalyptic number.

161606207 is a deficient number, since it is larger than the sum of its proper divisors (23086609).

161606207 is an equidigital number, since it uses as much as digits as its factorization.

161606207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23086608.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 161606207 is about 12712.4429988889. The cubic root of 161606207 is about 544.6941099725.

The spelling of 161606207 in words is "one hundred sixty-one million, six hundred six thousand, two hundred seven".