125515400999 has 2 divisors, whose sum is σ = 125515401000. Its totient is φ = 125515400998.

The previous prime is 125515400953. The next prime is 125515401047. The reversal of 125515400999 is 999004515521.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125515400999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125515420999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62757700499 + 62757700500.

It is an arithmetic number, because the mean of its divisors is an integer number (62757700500).

Almost surely, 2^125515400999 is an apocalyptic number.

125515400999 is a deficient number, since it is larger than the sum of its proper divisors (1).

125515400999 is an equidigital number, since it uses as much as digits as its factorization.

125515400999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729000, while the sum is 50.

The spelling of 125515400999 in words is "one hundred twenty-five billion, five hundred fifteen million, four hundred thousand, nine hundred ninety-nine".