20125599587689 has 2 divisors, whose sum is σ = 20125599587690. Its totient is φ = 20125599587688.

The previous prime is 20125599587677. The next prime is 20125599587699. The reversal of 20125599587689 is 98678599552102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20112713478400 + 12886109289 = 4484720^2 + 113517^2 .

It is a cyclic number.

It is not a de Polignac number, because 20125599587689 - 2¹⁷ = 20125599456617 is a prime.

It is not a weakly prime, because it can be changed into another prime (20125599587609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10062799793844 + 10062799793845.

It is an arithmetic number, because the mean of its divisors is an integer number (10062799793845).

Almost surely, 2^{20125599587689} is an apocalyptic number.

It is an amenable number.

20125599587689 is a deficient number, since it is larger than the sum of its proper divisors (1).

20125599587689 is an equidigital number, since it uses as much as digits as its factorization.

20125599587689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776000, while the sum is 76.

The spelling of 20125599587689 in words is "twenty trillion, one hundred twenty-five billion, five hundred ninety-nine million, five hundred eighty-seven thousand, six hundred eighty-nine".