126645661 has 2 divisors, whose sum is σ = 126645662. Its totient is φ = 126645660.

The previous prime is 126645643. The next prime is 126645667. The reversal of 126645661 is 166546621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125574436 + 1071225 = 11206^2 + 1035^2 .

It is an emirp because it is prime and its reverse (166546621) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126645661 is a prime.

It is a super-3 number, since 3×126645661³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 126645661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126645667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63322830 + 63322831.

It is an arithmetic number, because the mean of its divisors is an integer number (63322831).

Almost surely, 2^126645661 is an apocalyptic number.

It is an amenable number.

126645661 is a deficient number, since it is larger than the sum of its proper divisors (1).

126645661 is an equidigital number, since it uses as much as digits as its factorization.

126645661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 37.

The square root of 126645661 is about 11253.6954374996. The cubic root of 126645661 is about 502.1846553265.

The spelling of 126645661 in words is "one hundred twenty-six million, six hundred forty-five thousand, six hundred sixty-one".