161642708 has 6 divisors (see below), whose sum is σ = 282874746. Its totient is φ = 80821352.

The previous prime is 161642641. The next prime is 161642731. The reversal of 161642708 is 807246161.

It can be written as a sum of positive squares in only one way, i.e., 118766404 + 42876304 = 10898^2 + 6548^2 .

It is a super-2 number, since 2×161642708² = 52256730099146528, which contains 22 as substring.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 20205335 + ... + 20205342.

It is an arithmetic number, because the mean of its divisors is an integer number (47145791).

Almost surely, 2^161642708 is an apocalyptic number.

It is an amenable number.

161642708 is a deficient number, since it is larger than the sum of its proper divisors (121232038).

161642708 is a wasteful number, since it uses less digits than its factorization.

161642708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40410681 (or 40410679 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 161642708 is about 12713.8785584888. The cubic root of 161642708 is about 544.7351157883.

Adding to 161642708 its reverse (807246161), we get a palindrome (968888869).

The spelling of 161642708 in words is "one hundred sixty-one million, six hundred forty-two thousand, seven hundred eight".