126663805 has 4 divisors (see below), whose sum is σ = 151996572. Its totient is φ = 101331040.

The previous prime is 126663791. The next prime is 126663827. The reversal of 126663805 is 508366621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 68873401 + 57790404 = 8299^2 + 7602^2 .

It is not a de Polignac number, because 126663805 - 2⁵ = 126663773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12666376 + ... + 12666385.

It is an arithmetic number, because the mean of its divisors is an integer number (37999143).

Almost surely, 2^126663805 is an apocalyptic number.

It is an amenable number.

126663805 is a deficient number, since it is larger than the sum of its proper divisors (25332767).

126663805 is an equidigital number, since it uses as much as digits as its factorization.

126663805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25332766.

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

The square root of 126663805 is about 11254.5015438268. The cubic root of 126663805 is about 502.2086361542.

It can be divided in two parts, 12666 and 3805, that added together give a triangular number (16471 = T₁₈₁).

The spelling of 126663805 in words is "one hundred twenty-six million, six hundred sixty-three thousand, eight hundred five".