161566058 has 4 divisors (see below), whose sum is σ = 242349090. Its totient is φ = 80783028.

The previous prime is 161566051. The next prime is 161566073. The reversal of 161566058 is 850665161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 118309129 + 43256929 = 10877^2 + 6577^2 .

It is a super-2 number, since 2×161566058² = 52207182195318728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161566051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40391513 + ... + 40391516.

Almost surely, 2^161566058 is an apocalyptic number.

161566058 is a deficient number, since it is larger than the sum of its proper divisors (80783032).

161566058 is an equidigital number, since it uses as much as digits as its factorization.

161566058 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80783031.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 161566058 is about 12710.8637786737. The cubic root of 161566058 is about 544.6489988028.

The spelling of 161566058 in words is "one hundred sixty-one million, five hundred sixty-six thousand, fifty-eight".