126521663 has 2 divisors, whose sum is σ = 126521664. Its totient is φ = 126521662.

The previous prime is 126521657. The next prime is 126521671. The reversal of 126521663 is 366125621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 126521663 - 2¹⁸ = 126259519 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126521683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63260831 + 63260832.

It is an arithmetic number, because the mean of its divisors is an integer number (63260832).

Almost surely, 2^126521663 is an apocalyptic number.

126521663 is a deficient number, since it is larger than the sum of its proper divisors (1).

126521663 is an equidigital number, since it uses as much as digits as its factorization.

126521663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 32.

The square root of 126521663 is about 11248.1848757922. The cubic root of 126521663 is about 502.0207064892.

The spelling of 126521663 in words is "one hundred twenty-six million, five hundred twenty-one thousand, six hundred sixty-three".