161552538 has 24 divisors (see below), whose sum is σ = 400035168. Its totient is φ = 46157832.

The previous prime is 161552537. The next prime is 161552539. The reversal of 161552538 is 835255161.

It is a happy number.

161552538 is a `hidden beast` number, since 1 + 615 + 5 + 2 + 5 + 38 = 666.

It is an interprime number because it is at equal distance from previous prime (161552537) and next prime (161552539).

It is not an unprimeable number, because it can be changed into a prime (161552537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 640956 + ... + 641207.

It is an arithmetic number, because the mean of its divisors is an integer number (16668132).

Almost surely, 2^161552538 is an apocalyptic number.

161552538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

161552538 is an abundant number, since it is smaller than the sum of its proper divisors (238482630).

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

161552538 is a wasteful number, since it uses less digits than its factorization.

161552538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282178 (or 1282175 counting only the distinct ones).

The product of its digits is 36000, while the sum is 36.

The square root of 161552538 is about 12710.3319390172. The cubic root of 161552538 is about 544.6338061319.

The spelling of 161552538 in words is "one hundred sixty-one million, five hundred fifty-two thousand, five hundred thirty-eight".