161553847784 has 64 divisors (see below), whose sum is σ = 351050979840. Its totient is φ = 68265192960.

The previous prime is 161553847781. The next prime is 161553847787. The reversal of 161553847784 is 487748355161.

161553847784 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 (161553847781) and next prime (161553847787).

It is not an unprimeable number, because it can be changed into a prime (161553847781) 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 15 ways as a sum of consecutive naturals, for example, 16800962 + ... + 16810574.

It is an arithmetic number, because the mean of its divisors is an integer number (5485171560).

Almost surely, 2^161553847784 is an apocalyptic number.

161553847784 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161553847784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175525489920).

161553847784 is an abundant number, since it is smaller than the sum of its proper divisors (189497132056).

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

161553847784 is a wasteful number, since it uses less digits than its factorization.

161553847784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13810 (or 13806 counting only the distinct ones).

The product of its digits is 22579200, while the sum is 59.

The spelling of 161553847784 in words is "one hundred sixty-one billion, five hundred fifty-three million, eight hundred forty-seven thousand, seven hundred eighty-four".