43918563749 has 2 divisors, whose sum is σ = 43918563750. Its totient is φ = 43918563748.

The previous prime is 43918563673. The next prime is 43918563781. The reversal of 43918563749 is 94736581934.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38497186849 + 5421376900 = 196207^2 + 73630^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43918563749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43918563149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21959281874 + 21959281875.

It is an arithmetic number, because the mean of its divisors is an integer number (21959281875).

Almost surely, 2^43918563749 is an apocalyptic number.

It is an amenable number.

43918563749 is a deficient number, since it is larger than the sum of its proper divisors (1).

43918563749 is an equidigital number, since it uses as much as digits as its factorization.

43918563749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19595520, while the sum is 59.

The spelling of 43918563749 in words is "forty-three billion, nine hundred eighteen million, five hundred sixty-three thousand, seven hundred forty-nine".