125581224689 has 2 divisors, whose sum is σ = 125581224690. Its totient is φ = 125581224688.

The previous prime is 125581224611. The next prime is 125581224721. The reversal of 125581224689 is 986422185521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100175415025 + 25405809664 = 316505^2 + 159392^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125581224689 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 125581224689.

It is not a weakly prime, because it can be changed into another prime (125581224089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62790612344 + 62790612345.

It is an arithmetic number, because the mean of its divisors is an integer number (62790612345).

Almost surely, 2^125581224689 is an apocalyptic number.

It is an amenable number.

125581224689 is a deficient number, since it is larger than the sum of its proper divisors (1).

125581224689 is an equidigital number, since it uses as much as digits as its factorization.

125581224689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2764800, while the sum is 53.

The spelling of 125581224689 in words is "one hundred twenty-five billion, five hundred eighty-one million, two hundred twenty-four thousand, six hundred eighty-nine".