161308989452 has 48 divisors (see below), whose sum is σ = 317513226240. Its totient is φ = 71148187968.

The previous prime is 161308989451. The next prime is 161308989469. The reversal of 161308989452 is 254989803161.

It is not an unprimeable number, because it can be changed into a prime (161308989451) 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 15 ways as a sum of consecutive naturals, for example, 1258049 + ... + 1380327.

It is an arithmetic number, because the mean of its divisors is an integer number (6614858880).

Almost surely, 2^161308989452 is an apocalyptic number.

It is an amenable number.

161308989452 is a deficient number, since it is larger than the sum of its proper divisors (156204236788).

161308989452 is a wasteful number, since it uses less digits than its factorization.

161308989452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123422 (or 123420 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 56.

The spelling of 161308989452 in words is "one hundred sixty-one billion, three hundred eight million, nine hundred eighty-nine thousand, four hundred fifty-two".