161624618 has 4 divisors (see below), whose sum is σ = 242436930. Its totient is φ = 80812308.

The previous prime is 161624597. The next prime is 161624629. The reversal of 161624618 is 816426161.

161624618 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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., 95316169 + 66308449 = 9763^2 + 8143^2 .

It is a super-2 number, since 2×161624618² = 52245034287291848, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40406153 + ... + 40406156.

Almost surely, 2^161624618 is an apocalyptic number.

161624618 is a deficient number, since it is larger than the sum of its proper divisors (80812312).

161624618 is an equidigital number, since it uses as much as digits as its factorization.

161624618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80812311.

The product of its digits is 13824, while the sum is 35.

The square root of 161624618 is about 12713.1671113063. The cubic root of 161624618 is about 544.7147939604.

The spelling of 161624618 in words is "one hundred sixty-one million, six hundred twenty-four thousand, six hundred eighteen".