161736432500 has 30 divisors (see below), whose sum is σ = 353685236058. Its totient is φ = 64694572000.

The previous prime is 161736432497. The next prime is 161736432503. The reversal of 161736432500 is 5234637161.

161736432500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161736432497) and next prime (161736432503).

It can be written as a sum of positive squares in 5 ways, for example, as 54370114276 + 107366318224 = 233174^2 + 327668^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161736432503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 32344787 + ... + 32349786.

Almost surely, 2^161736432500 is an apocalyptic number.

161736432500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161736432500 is an abundant number, since it is smaller than the sum of its proper divisors (191948803558).

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

161736432500 is an equidigital number, since it uses as much as digits as its factorization.

161736432500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64694597 (or 64694580 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 38.

The spelling of 161736432500 in words is "one hundred sixty-one billion, seven hundred thirty-six million, four hundred thirty-two thousand, five hundred".