161440204 has 24 divisors (see below), whose sum is σ = 286720560. Its totient is φ = 79527936.

The previous prime is 161440193. The next prime is 161440231. The reversal of 161440204 is 402044161.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98907 + ... + 100525.

It is an arithmetic number, because the mean of its divisors is an integer number (11946690).

Almost surely, 2^161440204 is an apocalyptic number.

It is an amenable number.

161440204 is a deficient number, since it is larger than the sum of its proper divisors (125280356).

161440204 is a wasteful number, since it uses less digits than its factorization.

161440204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1977 (or 1975 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 161440204 is about 12705.9121671763. The cubic root of 161440204 is about 544.5075415727.

Adding to 161440204 its reverse (402044161), we get a palindrome (563484365).

The spelling of 161440204 in words is "one hundred sixty-one million, four hundred forty thousand, two hundred four".