43663670399 has 2 divisors, whose sum is σ = 43663670400. Its totient is φ = 43663670398.

The previous prime is 43663670387. The next prime is 43663670443. The reversal of 43663670399 is 99307636634.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43663670399 - 2²⁴ = 43646893183 is a prime.

It is a super-2 number, since 2×43663670399² (a number of 22 digits) contains 22 as substring.

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 (43663670359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21831835199 + 21831835200.

It is an arithmetic number, because the mean of its divisors is an integer number (21831835200).

Almost surely, 2^43663670399 is an apocalyptic number.

43663670399 is a deficient number, since it is larger than the sum of its proper divisors (1).

43663670399 is an equidigital number, since it uses as much as digits as its factorization.

43663670399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13226976, while the sum is 56.

The spelling of 43663670399 in words is "forty-three billion, six hundred sixty-three million, six hundred seventy thousand, three hundred ninety-nine".