161224665 has 16 divisors (see below), whose sum is σ = 294811008. Its totient is φ = 73702656.

The previous prime is 161224627. The next prime is 161224681. The reversal of 161224665 is 566422161.

It is not a de Polignac number, because 161224665 - 2¹⁵ = 161191897 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 767632 + ... + 767841.

It is an arithmetic number, because the mean of its divisors is an integer number (18425688).

Almost surely, 2^161224665 is an apocalyptic number.

161224665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161224665 is a deficient number, since it is larger than the sum of its proper divisors (133586343).

161224665 is a wasteful number, since it uses less digits than its factorization.

161224665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1535488.

The product of its digits is 17280, while the sum is 33.

The square root of 161224665 is about 12697.4274953630. The cubic root of 161224665 is about 544.2651094375.

The spelling of 161224665 in words is "one hundred sixty-one million, two hundred twenty-four thousand, six hundred sixty-five".