16656140025 has 96 divisors (see below), whose sum is σ = 35683232000. Its totient is φ = 7614129600.

The previous prime is 16656140003. The next prime is 16656140027. The reversal of 16656140025 is 52004165661.

16656140025 is a `hidden beast` number, since 16 + 6 + 5 + 614 + 0 + 0 + 25 = 666.

16656140025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16656140025 - 2⁶ = 16656139961 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16656140027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 195555 + ... + 267495.

Almost surely, 2^16656140025 is an apocalyptic number.

16656140025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16656140025 is an abundant number, since it is smaller than the sum of its proper divisors (19027091975).

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

16656140025 is an equidigital number, since it uses as much as digits as its factorization.

16656140025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71981 (or 71956 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 16656140025 in words is "sixteen billion, six hundred fifty-six million, one hundred forty thousand, twenty-five".