125999966 has 4 divisors (see below), whose sum is σ = 188999952. Its totient is φ = 62999982.

The previous prime is 125999959. The next prime is 126000013. The reversal of 125999966 is 669999521.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31499990 + ... + 31499993.

It is an arithmetic number, because the mean of its divisors is an integer number (47249988).

Almost surely, 2^125999966 is an apocalyptic number.

125999966 is a deficient number, since it is larger than the sum of its proper divisors (62999986).

125999966 is an equidigital number, since it uses as much as digits as its factorization.

125999966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62999985.

The product of its digits is 2361960, while the sum is 56.

The square root of 125999966 is about 11224.9706458414. The cubic root of 125999966 is about 501.3297484033.

The spelling of 125999966 in words is "one hundred twenty-five million, nine hundred ninety-nine thousand, nine hundred sixty-six".