161506011 has 8 divisors (see below), whose sum is σ = 220593744. Its totient is φ = 105044480.

The previous prime is 161505997. The next prime is 161506013. The reversal of 161506011 is 110605161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161506011 - 2⁹ = 161505499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161506013) by changing a digit.

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, 656406 + ... + 656651.

It is an arithmetic number, because the mean of its divisors is an integer number (27574218).

Almost surely, 2^161506011 is an apocalyptic number.

161506011 is a deficient number, since it is larger than the sum of its proper divisors (59087733).

161506011 is a wasteful number, since it uses less digits than its factorization.

161506011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1313101.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 161506011 is about 12708.5015245701. The cubic root of 161506011 is about 544.5815164135.

The spelling of 161506011 in words is "one hundred sixty-one million, five hundred six thousand, eleven".