125756578009 has 2 divisors, whose sum is σ = 125756578010. Its totient is φ = 125756578008.

The previous prime is 125756577979. The next prime is 125756578033. The reversal of 125756578009 is 900875657521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90810014409 + 34946563600 = 301347^2 + 186940^2 .

It is a cyclic number.

It is not a de Polignac number, because 125756578009 - 2²¹ = 125754480857 is a prime.

It is not a weakly prime, because it can be changed into another prime (125756578709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62878289004 + 62878289005.

It is an arithmetic number, because the mean of its divisors is an integer number (62878289005).

Almost surely, 2^125756578009 is an apocalyptic number.

It is an amenable number.

125756578009 is a deficient number, since it is larger than the sum of its proper divisors (1).

125756578009 is an equidigital number, since it uses as much as digits as its factorization.

125756578009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292000, while the sum is 55.

The spelling of 125756578009 in words is "one hundred twenty-five billion, seven hundred fifty-six million, five hundred seventy-eight thousand, nine".