125999999999 has 4 divisors (see below), whose sum is σ = 130064516160. Its totient is φ = 121935483840.

The previous prime is 125999999969. The next prime is 126000000029. The reversal of 125999999999 is 999999999521.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (125999999969) and next prime (126000000029).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125999999999 is a prime.

It is a Duffinian number.

125999999999 is a modest number, since divided by 999999 gives 125999 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125999999969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2032258034 + ... + 2032258095.

It is an arithmetic number, because the mean of its divisors is an integer number (32516129040).

Almost surely, 2^125999999999 is an apocalyptic number.

125999999999 is a deficient number, since it is larger than the sum of its proper divisors (4064516161).

125999999999 is an equidigital number, since it uses as much as digits as its factorization.

125999999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4064516160.

The product of its digits is 3874204890, while the sum is 89.

The spelling of 125999999999 in words is "one hundred twenty-five billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".