43499778659 has 2 divisors, whose sum is σ = 43499778660. Its totient is φ = 43499778658.

The previous prime is 43499778631. The next prime is 43499778661. The reversal of 43499778659 is 95687799434.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43499778659 - 2⁸ = 43499778403 is a prime.

Together with 43499778661, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 43499778592 and 43499778601.

It is not a weakly prime, because it can be changed into another prime (43499718659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21749889329 + 21749889330.

It is an arithmetic number, because the mean of its divisors is an integer number (21749889330).

Almost surely, 2^43499778659 is an apocalyptic number.

43499778659 is a deficient number, since it is larger than the sum of its proper divisors (1).

43499778659 is an equidigital number, since it uses as much as digits as its factorization.

43499778659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 411505920, while the sum is 71.

The spelling of 43499778659 in words is "forty-three billion, four hundred ninety-nine million, seven hundred seventy-eight thousand, six hundred fifty-nine".