161164004500 has 24 divisors (see below), whose sum is σ = 351982186920. Its totient is φ = 64465601600.

The previous prime is 161164004483. The next prime is 161164004509. The reversal of 161164004500 is 5400461161.

It can be written as a sum of positive squares in 4 ways, for example, as 62916624 + 161101087876 = 7932^2 + 401374^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161164004509) 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 7 ways as a sum of consecutive naturals, for example, 161163505 + ... + 161164504.

It is an arithmetic number, because the mean of its divisors is an integer number (14665924455).

Almost surely, 2^161164004500 is an apocalyptic number.

161164004500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161164004500 is an abundant number, since it is smaller than the sum of its proper divisors (190818182420).

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

161164004500 is a wasteful number, since it uses less digits than its factorization.

161164004500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322328028 (or 322328016 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

Adding to 161164004500 its reverse (5400461161), we get a palindrome (166564465661).

The spelling of 161164004500 in words is "one hundred sixty-one billion, one hundred sixty-four million, four thousand, five hundred".