161600181100 has 18 divisors (see below), whose sum is σ = 350672393204. Its totient is φ = 64640072400.

The previous prime is 161600181049. The next prime is 161600181101. The reversal of 161600181100 is 1181006161.

It is a super-2 number, since 2×161600181100² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (161600181101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 808000806 + ... + 808001005.

Almost surely, 2^161600181100 is an apocalyptic number.

161600181100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161600181100 is an abundant number, since it is smaller than the sum of its proper divisors (189072212104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161600181100 is a wasteful number, since it uses less digits than its factorization.

161600181100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616001825 (or 1616001818 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 25.

Adding to 161600181100 its reverse (1181006161), we get a palindrome (162781187261).

The spelling of 161600181100 in words is "one hundred sixty-one billion, six hundred million, one hundred eighty-one thousand, one hundred".