161847454788 has 18 divisors (see below), whose sum is σ = 409114399694. Its totient is φ = 53949151584.

The previous prime is 161847454781. The next prime is 161847454829. The reversal of 161847454788 is 887454748161.

161847454788 is a `hidden beast` number, since 1 + 6 + 1 + 8 + 4 + 7 + 4 + 547 + 88 = 666.

It can be written as a sum of positive squares in only one way, i.e., 161835634944 + 11819844 = 402288^2 + 3438^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (161847454781) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2247881281 + ... + 2247881352.

Almost surely, 2^161847454788 is an apocalyptic number.

161847454788 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

161847454788 is an abundant number, since it is smaller than the sum of its proper divisors (247266944906).

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

161847454788 is a wasteful number, since it uses less digits than its factorization.

161847454788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4495762643 (or 4495762638 counting only the distinct ones).

The product of its digits is 48168960, while the sum is 63.

The spelling of 161847454788 in words is "one hundred sixty-one billion, eight hundred forty-seven million, four hundred fifty-four thousand, seven hundred eighty-eight".