43663699217 has 2 divisors, whose sum is σ = 43663699218. Its totient is φ = 43663699216.

The previous prime is 43663699141. The next prime is 43663699271. The reversal of 43663699217 is 71299636634.

Together with next prime (43663699271) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42865975681 + 797723536 = 207041^2 + 28244^2 .

It is a cyclic number.

It is not a de Polignac number, because 43663699217 - 2²⁸ = 43395263761 is a prime.

It is not a weakly prime, because it can be changed into another prime (43663699117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21831849608 + 21831849609.

It is an arithmetic number, because the mean of its divisors is an integer number (21831849609).

Almost surely, 2^43663699217 is an apocalyptic number.

It is an amenable number.

43663699217 is a deficient number, since it is larger than the sum of its proper divisors (1).

43663699217 is an equidigital number, since it uses as much as digits as its factorization.

43663699217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8817984, while the sum is 56.

The spelling of 43663699217 in words is "forty-three billion, six hundred sixty-three million, six hundred ninety-nine thousand, two hundred seventeen".