43664512231 has 2 divisors, whose sum is σ = 43664512232. Its totient is φ = 43664512230.

The previous prime is 43664512217. The next prime is 43664512253. The reversal of 43664512231 is 13221546634.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43664512231 - 2³¹ = 41517028583 is a prime.

It is a super-2 number, since 2×43664512231² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43664512211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21832256115 + 21832256116.

It is an arithmetic number, because the mean of its divisors is an integer number (21832256116).

Almost surely, 2^43664512231 is an apocalyptic number.

43664512231 is a deficient number, since it is larger than the sum of its proper divisors (1).

43664512231 is an equidigital number, since it uses as much as digits as its factorization.

43664512231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 37.

The spelling of 43664512231 in words is "forty-three billion, six hundred sixty-four million, five hundred twelve thousand, two hundred thirty-one".