161543706 has 16 divisors (see below), whose sum is σ = 323784864. Its totient is φ = 53731664.

The previous prime is 161543621. The next prime is 161543761. The reversal of 161543706 is 607345161.

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, 26025 + ... + 31628.

It is an arithmetic number, because the mean of its divisors is an integer number (20236554).

Almost surely, 2^161543706 is an apocalyptic number.

161543706 is the 8039-th centered pentagonal number.

161543706 is an abundant number, since it is smaller than the sum of its proper divisors (162241158).

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

161543706 is a wasteful number, since it uses less digits than its factorization.

161543706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58125.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 161543706 is about 12709.9845003839. The cubic root of 161543706 is about 544.6238809944.

Adding to 161543706 its reverse (607345161), we get a palindrome (768888867).

The spelling of 161543706 in words is "one hundred sixty-one million, five hundred forty-three thousand, seven hundred six".