126664512365 has 4 divisors (see below), whose sum is σ = 151997414844. Its totient is φ = 101331609888.

The previous prime is 126664512361. The next prime is 126664512371. The reversal of 126664512365 is 563215466621.

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 43442648041 + 83221864324 = 208429^2 + 288482^2 .

It is a cyclic number.

It is not a de Polignac number, because 126664512365 - 2² = 126664512361 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126664512361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12666451232 + ... + 12666451241.

It is an arithmetic number, because the mean of its divisors is an integer number (37999353711).

Almost surely, 2^126664512365 is an apocalyptic number.

It is an amenable number.

126664512365 is a deficient number, since it is larger than the sum of its proper divisors (25332902479).

126664512365 is an equidigital number, since it uses as much as digits as its factorization.

126664512365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25332902478.

The product of its digits is 1555200, while the sum is 47.

Adding to 126664512365 its reverse (563215466621), we get a palindrome (689879978986).

The spelling of 126664512365 in words is "one hundred twenty-six billion, six hundred sixty-four million, five hundred twelve thousand, three hundred sixty-five".