43951440647 has 2 divisors, whose sum is σ = 43951440648. Its totient is φ = 43951440646.

The previous prime is 43951440641. The next prime is 43951440677. The reversal of 43951440647 is 74604415934.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43951440647 - 2⁶ = 43951440583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43951440641) 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, 21975720323 + 21975720324.

It is an arithmetic number, because the mean of its divisors is an integer number (21975720324).

Almost surely, 2^43951440647 is an apocalyptic number.

43951440647 is a deficient number, since it is larger than the sum of its proper divisors (1).

43951440647 is an equidigital number, since it uses as much as digits as its factorization.

43951440647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1451520, while the sum is 47.

The spelling of 43951440647 in words is "forty-three billion, nine hundred fifty-one million, four hundred forty thousand, six hundred forty-seven".