161540556 has 24 divisors (see below), whose sum is σ = 389926320. Its totient is φ = 51989952.

The previous prime is 161540539. The next prime is 161540567. The reversal of 161540556 is 655045161.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231751 + ... + 232446.

It is an arithmetic number, because the mean of its divisors is an integer number (16246930).

Almost surely, 2^161540556 is an apocalyptic number.

It is an amenable number.

161540556 is an abundant number, since it is smaller than the sum of its proper divisors (228385764).

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

161540556 is a wasteful number, since it uses less digits than its factorization.

161540556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464233 (or 464231 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 161540556 is about 12709.8605814541. The cubic root of 161540556 is about 544.6203410311.

The spelling of 161540556 in words is "one hundred sixty-one million, five hundred forty thousand, five hundred fifty-six".