20125643067251 has 4 divisors (see below), whose sum is σ = 20125682890104. Its totient is φ = 20125603244400.

The previous prime is 20125643067247. The next prime is 20125643067289. The reversal of 20125643067251 is 15276034652102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20125643067251 - 2² = 20125643067247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20125643067241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19143485 + ... + 20167406.

It is an arithmetic number, because the mean of its divisors is an integer number (5031420722526).

Almost surely, 2^{20125643067251} is an apocalyptic number.

20125643067251 is a deficient number, since it is larger than the sum of its proper divisors (39822853).

20125643067251 is an equidigital number, since it uses as much as digits as its factorization.

20125643067251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39822852.

The product of its (nonzero) digits is 604800, while the sum is 44.

The spelling of 20125643067251 in words is "twenty trillion, one hundred twenty-five billion, six hundred forty-three million, sixty-seven thousand, two hundred fifty-one".