163556894973 has 8 divisors (see below), whose sum is σ = 218415016288. Its totient is φ = 108868351824.

The previous prime is 163556894933. The next prime is 163556894987. The reversal of 163556894973 is 379498655361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 163556894973 - 2¹⁰ = 163556893949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163556894933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42392290 + ... + 42396147.

It is an arithmetic number, because the mean of its divisors is an integer number (27301877036).

Almost surely, 2^163556894973 is an apocalyptic number.

It is an amenable number.

163556894973 is a deficient number, since it is larger than the sum of its proper divisors (54858121315).

163556894973 is an equidigital number, since it uses as much as digits as its factorization.

163556894973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84789083.

The product of its digits is 146966400, while the sum is 66.

The spelling of 163556894973 in words is "one hundred sixty-three billion, five hundred fifty-six million, eight hundred ninety-four thousand, nine hundred seventy-three".