161963556 has 24 divisors (see below), whose sum is σ = 400145760. Its totient is φ = 50812032.

The previous prime is 161963531. The next prime is 161963569. The reversal of 161963556 is 655369161.

161963556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-4 number, since 4×161963556⁴ (a number of 34 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 396766 + ... + 397173.

It is an arithmetic number, because the mean of its divisors is an integer number (16672740).

Almost surely, 2^161963556 is an apocalyptic number.

It is an amenable number.

161963556 is an abundant number, since it is smaller than the sum of its proper divisors (238182204).

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

161963556 is a wasteful number, since it uses less digits than its factorization.

161963556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793963 (or 793961 counting only the distinct ones).

The product of its digits is 145800, while the sum is 42.

The square root of 161963556 is about 12726.4903253018. The cubic root of 161963556 is about 545.0952963006.

The spelling of 161963556 in words is "one hundred sixty-one million, nine hundred sixty-three thousand, five hundred fifty-six".