161558807 has 2 divisors, whose sum is σ = 161558808. Its totient is φ = 161558806.

The previous prime is 161558801. The next prime is 161558821. The reversal of 161558807 is 708855161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161558807 - 2⁶ = 161558743 is a prime.

It is a super-2 number, since 2×161558807² = 52202496238526498, which contains 22 as substring.

It is a Chen prime.

It is equal to p_9056948 and since 161558807 and 9056948 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161558801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80779403 + 80779404.

It is an arithmetic number, because the mean of its divisors is an integer number (80779404).

Almost surely, 2^161558807 is an apocalyptic number.

161558807 is a deficient number, since it is larger than the sum of its proper divisors (1).

161558807 is an equidigital number, since it uses as much as digits as its factorization.

161558807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 67200, while the sum is 41.

The square root of 161558807 is about 12710.5785470214. The cubic root of 161558807 is about 544.6408508271.

The spelling of 161558807 in words is "one hundred sixty-one million, five hundred fifty-eight thousand, eight hundred seven".