16656111021525 has 12 divisors (see below), whose sum is σ = 27538103555712. Its totient is φ = 8883259211440.

The previous prime is 16656111021523. The next prime is 16656111021527. The reversal of 16656111021525 is 52512011165661.

It is an interprime number because it is at equal distance from previous prime (16656111021523) and next prime (16656111021527).

It is not a de Polignac number, because 16656111021525 - 2¹ = 16656111021523 is a prime.

It is a super-2 number, since 2×16656111021525² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16656111021523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111040740069 + ... + 111040740218.

It is an arithmetic number, because the mean of its divisors is an integer number (2294841962976).

Almost surely, 2^{16656111021525} is an apocalyptic number.

16656111021525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16656111021525 is a deficient number, since it is larger than the sum of its proper divisors (10881992534187).

16656111021525 is a wasteful number, since it uses less digits than its factorization.

16656111021525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222081480300 (or 222081480295 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 42.

The spelling of 16656111021525 in words is "sixteen trillion, six hundred fifty-six billion, one hundred eleven million, twenty-one thousand, five hundred twenty-five".