126665402057 has 2 divisors, whose sum is σ = 126665402058. Its totient is φ = 126665402056.

The previous prime is 126665401997. The next prime is 126665402069. The reversal of 126665402057 is 750204566621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79852021561 + 46813380496 = 282581^2 + 216364^2 .

It is a cyclic number.

It is not a de Polignac number, because 126665402057 - 2¹⁰ = 126665401033 is a prime.

It is a super-2 number, since 2×126665402057² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 126665401999 and 126665402017.

It is not a weakly prime, because it can be changed into another prime (126665402957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63332701028 + 63332701029.

It is an arithmetic number, because the mean of its divisors is an integer number (63332701029).

Almost surely, 2^126665402057 is an apocalyptic number.

It is an amenable number.

126665402057 is a deficient number, since it is larger than the sum of its proper divisors (1).

126665402057 is an equidigital number, since it uses as much as digits as its factorization.

126665402057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 604800, while the sum is 44.

Adding to 126665402057 its reverse (750204566621), we get a palindrome (876869968678).

The spelling of 126665402057 in words is "one hundred twenty-six billion, six hundred sixty-five million, four hundred two thousand, fifty-seven".