20125718761787 has 4 divisors (see below), whose sum is σ = 20455648577616. Its totient is φ = 19795788945960.

The previous prime is 20125718761763. The next prime is 20125718761829. The reversal of 20125718761787 is 78716781752102.

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 20125718761787 - 2³² = 20121423794491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20125718761387) 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, 164964907823 + ... + 164964907944.

It is an arithmetic number, because the mean of its divisors is an integer number (5113912144404).

Almost surely, 2^{20125718761787} is an apocalyptic number.

20125718761787 is a deficient number, since it is larger than the sum of its proper divisors (329929815829).

20125718761787 is an equidigital number, since it uses as much as digits as its factorization.

20125718761787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329929815828.

The product of its (nonzero) digits is 18439680, while the sum is 62.

The spelling of 20125718761787 in words is "twenty trillion, one hundred twenty-five billion, seven hundred eighteen million, seven hundred sixty-one thousand, seven hundred eighty-seven".