125378262649 has 2 divisors, whose sum is σ = 125378262650. Its totient is φ = 125378262648.

The previous prime is 125378262601. The next prime is 125378262707. The reversal of 125378262649 is 946262873521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116175314025 + 9202948624 = 340845^2 + 95932^2 .

It is a cyclic number.

It is not a de Polignac number, because 125378262649 - 2⁹ = 125378262137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 125378262649.

It is not a weakly prime, because it can be changed into another prime (125378362649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62689131324 + 62689131325.

It is an arithmetic number, because the mean of its divisors is an integer number (62689131325).

Almost surely, 2^125378262649 is an apocalyptic number.

It is an amenable number.

125378262649 is a deficient number, since it is larger than the sum of its proper divisors (1).

125378262649 is an equidigital number, since it uses as much as digits as its factorization.

125378262649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8709120, while the sum is 55.

The spelling of 125378262649 in words is "one hundred twenty-five billion, three hundred seventy-eight million, two hundred sixty-two thousand, six hundred forty-nine".