125721265766 has 16 divisors (see below), whose sum is σ = 189466410960. Its totient is φ = 62566483200.

The previous prime is 125721265759. The next prime is 125721265771. The reversal of 125721265766 is 667562127521.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195005 + ... + 538023.

It is an arithmetic number, because the mean of its divisors is an integer number (11841650685).

Almost surely, 2^125721265766 is an apocalyptic number.

125721265766 is a deficient number, since it is larger than the sum of its proper divisors (63745145194).

125721265766 is a wasteful number, since it uses less digits than its factorization.

125721265766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343879.

The product of its digits is 2116800, while the sum is 50.

The spelling of 125721265766 in words is "one hundred twenty-five billion, seven hundred twenty-one million, two hundred sixty-five thousand, seven hundred sixty-six".