16506205256 has 8 divisors (see below), whose sum is σ = 30949134870. Its totient is φ = 8253102624.

The previous prime is 16506205241. The next prime is 16506205259. The reversal of 16506205256 is 65250260561.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11601444100 + 4904761156 = 107710^2 + 70034^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (16506205259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1031637821 + ... + 1031637836.

Almost surely, 2^16506205256 is an apocalyptic number.

It is an amenable number.

16506205256 is a deficient number, since it is larger than the sum of its proper divisors (14442929614).

16506205256 is a wasteful number, since it uses less digits than its factorization.

16506205256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2063275663 (or 2063275659 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 38.

The spelling of 16506205256 in words is "sixteen billion, five hundred six million, two hundred five thousand, two hundred fifty-six".