161203801656 has 64 divisors (see below), whose sum is σ = 426767680800. Its totient is φ = 50567610368.

The previous prime is 161203801651. The next prime is 161203801657. The reversal of 161203801656 is 656108302161.

161203801656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161203801651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4301656 + ... + 4338968.

Almost surely, 2^161203801656 is an apocalyptic number.

It is an amenable number.

161203801656 is an abundant number, since it is smaller than the sum of its proper divisors (265563879144).

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

161203801656 is a wasteful number, since it uses less digits than its factorization.

161203801656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47928 (or 47924 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The spelling of 161203801656 in words is "one hundred sixty-one billion, two hundred three million, eight hundred one thousand, six hundred fifty-six".