125478359989 has 2 divisors, whose sum is σ = 125478359990. Its totient is φ = 125478359988.

The previous prime is 125478359959. The next prime is 125478360001. The reversal of 125478359989 is 989953874521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119323957489 + 6154402500 = 345433^2 + 78450^2 .

It is a cyclic number.

It is not a de Polignac number, because 125478359989 - 2¹⁹ = 125477835701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125478359959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62739179994 + 62739179995.

It is an arithmetic number, because the mean of its divisors is an integer number (62739179995).

Almost surely, 2^125478359989 is an apocalyptic number.

It is an amenable number.

125478359989 is a deficient number, since it is larger than the sum of its proper divisors (1).

125478359989 is an equidigital number, since it uses as much as digits as its factorization.

125478359989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 195955200, while the sum is 70.

The spelling of 125478359989 in words is "one hundred twenty-five billion, four hundred seventy-eight million, three hundred fifty-nine thousand, nine hundred eighty-nine".