161543642 has 32 divisors (see below), whose sum is σ = 265676544. Its totient is φ = 73224000.

The previous prime is 161543621. The next prime is 161543761. The reversal of 161543642 is 246345161.

It is a junction number, because it is equal to n+sod(n) for n = 161543599 and 161543608.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 595967 + ... + 596237.

It is an arithmetic number, because the mean of its divisors is an integer number (8302392).

Almost surely, 2^161543642 is an apocalyptic number.

161543642 is a deficient number, since it is larger than the sum of its proper divisors (104132902).

161543642 is a wasteful number, since it uses less digits than its factorization.

161543642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614.

The product of its digits is 17280, while the sum is 32.

The square root of 161543642 is about 12709.9819826780. The cubic root of 161543642 is about 544.6238090718.

The spelling of 161543642 in words is "one hundred sixty-one million, five hundred forty-three thousand, six hundred forty-two".