20166226170725 has 12 divisors (see below), whose sum is σ = 26322232055040. Its totient is φ = 15283876676400.

The previous prime is 20166226170721. The next prime is 20166226170731. The reversal of 20166226170725 is 52707162266102.

It is not a de Polignac number, because 20166226170725 - 2² = 20166226170721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20166226170725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20166226170721) 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, 21227606021 + ... + 21227606970.

It is an arithmetic number, because the mean of its divisors is an integer number (2193519337920).

Almost surely, 2^{20166226170725} is an apocalyptic number.

20166226170725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20166226170725 is a deficient number, since it is larger than the sum of its proper divisors (6156005884315).

20166226170725 is a wasteful number, since it uses less digits than its factorization.

20166226170725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42455213020 (or 42455213015 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 47.

The spelling of 20166226170725 in words is "twenty trillion, one hundred sixty-six billion, two hundred twenty-six million, one hundred seventy thousand, seven hundred twenty-five".