125661774566 has 16 divisors (see below), whose sum is σ = 192638628864. Its totient is φ = 61450780104.

The previous prime is 125661774523. The next prime is 125661774569. The reversal of 125661774566 is 665477166521.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125661774569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 335960 + ... + 603483.

It is an arithmetic number, because the mean of its divisors is an integer number (12039914304).

Almost surely, 2^125661774566 is an apocalyptic number.

125661774566 is a deficient number, since it is larger than the sum of its proper divisors (66976854298).

125661774566 is a wasteful number, since it uses less digits than its factorization.

125661774566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940915.

The product of its digits is 12700800, while the sum is 56.

The spelling of 125661774566 in words is "one hundred twenty-five billion, six hundred sixty-one million, seven hundred seventy-four thousand, five hundred sixty-six".