161800407 has 18 divisors (see below), whose sum is σ = 248272128. Its totient is φ = 101520192.

The previous prime is 161800403. The next prime is 161800433. The reversal of 161800407 is 704008161.

It is a happy number.

161800407 is a `hidden beast` number, since 1 + 618 + 0 + 0 + 40 + 7 = 666.

161800407 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161800407 - 2² = 161800403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161800403) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 28503 + ... + 33704.

It is an arithmetic number, because the mean of its divisors is an integer number (13792896).

Almost surely, 2^161800407 is an apocalyptic number.

161800407 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

161800407 is a deficient number, since it is larger than the sum of its proper divisors (86471721).

161800407 is a wasteful number, since it uses less digits than its factorization.

161800407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62247 (or 62227 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 161800407 is about 12720.0788912648. The cubic root of 161800407 is about 544.9122064906.

Adding to 161800407 its reverse (704008161), we get a palindrome (865808568).

The spelling of 161800407 in words is "one hundred sixty-one million, eight hundred thousand, four hundred seven".