161563752804 has 12 divisors (see below), whose sum is σ = 376982089904. Its totient is φ = 53854584264.

The previous prime is 161563752797. The next prime is 161563752821. The reversal of 161563752804 is 408257365161.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×161563752804³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6731823022 + ... + 6731823045.

Almost surely, 2^161563752804 is an apocalyptic number.

It is an amenable number.

161563752804 is an abundant number, since it is smaller than the sum of its proper divisors (215418337100).

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

161563752804 is a wasteful number, since it uses less digits than its factorization.

161563752804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13463646074 (or 13463646072 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 48.

The spelling of 161563752804 in words is "one hundred sixty-one billion, five hundred sixty-three million, seven hundred fifty-two thousand, eight hundred four".