16001606556 has 36 divisors (see below), whose sum is σ = 43559930232. Its totient is φ = 4923571104.

The previous prime is 16001606549. The next prime is 16001606557. The reversal of 16001606556 is 65560610061.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×16001606556² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 16001606556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16001606557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17095266 + ... + 17096201.

It is an arithmetic number, because the mean of its divisors is an integer number (1209998062).

Almost surely, 2^16001606556 is an apocalyptic number.

It is an amenable number.

16001606556 is an abundant number, since it is smaller than the sum of its proper divisors (27558323676).

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

16001606556 is a wasteful number, since it uses less digits than its factorization.

16001606556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34191490 (or 34191485 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 16001606556 in words is "sixteen billion, one million, six hundred six thousand, five hundred fifty-six".