125766661 has 2 divisors, whose sum is σ = 125766662. Its totient is φ = 125766660.

The previous prime is 125766647. The next prime is 125766673. The reversal of 125766661 is 166667521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124746561 + 1020100 = 11169^2 + 1010^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125766661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125766601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62883330 + 62883331.

It is an arithmetic number, because the mean of its divisors is an integer number (62883331).

Almost surely, 2^125766661 is an apocalyptic number.

It is an amenable number.

125766661 is a deficient number, since it is larger than the sum of its proper divisors (1).

125766661 is an equidigital number, since it uses as much as digits as its factorization.

125766661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 40.

The square root of 125766661 is about 11214.5735986706. The cubic root of 125766661 is about 501.0201319129.

The spelling of 125766661 in words is "one hundred twenty-five million, seven hundred sixty-six thousand, six hundred sixty-one".