161386641 has 16 divisors (see below), whose sum is σ = 257483520. Its totient is φ = 99314640.

The previous prime is 161386639. The next prime is 161386669. The reversal of 161386641 is 146683161.

161386641 is a `hidden beast` number, since 1 + 6 + 1 + 3 + 8 + 6 + 641 = 666.

It is not a de Polignac number, because 161386641 - 2¹ = 161386639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161386596 and 161386605.

It is not an unprimeable number, because it can be changed into a prime (161386681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229545 + ... + 230246.

It is an arithmetic number, because the mean of its divisors is an integer number (16092720).

Almost surely, 2^161386641 is an apocalyptic number.

It is an amenable number.

161386641 is a deficient number, since it is larger than the sum of its proper divisors (96096879).

161386641 is a wasteful number, since it uses less digits than its factorization.

161386641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459813 (or 459807 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 161386641 is about 12703.8041940200. The cubic root of 161386641 is about 544.4473155926.

The spelling of 161386641 in words is "one hundred sixty-one million, three hundred eighty-six thousand, six hundred forty-one".