161565022 has 4 divisors (see below), whose sum is σ = 242347536. Its totient is φ = 80782510.

The previous prime is 161565011. The next prime is 161565031. The reversal of 161565022 is 220565161.

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

It is a super-2 number, since 2×161565022² = 52206512667720968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 40391254 + ... + 40391257.

It is an arithmetic number, because the mean of its divisors is an integer number (60586884).

Almost surely, 2^161565022 is an apocalyptic number.

161565022 is a deficient number, since it is larger than the sum of its proper divisors (80782514).

161565022 is an equidigital number, since it uses as much as digits as its factorization.

161565022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80782513.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 161565022 is about 12710.8230260672. The cubic root of 161565022 is about 544.6478346607.

The spelling of 161565022 in words is "one hundred sixty-one million, five hundred sixty-five thousand, twenty-two".