43621918651 has 2 divisors, whose sum is σ = 43621918652. Its totient is φ = 43621918650.

The previous prime is 43621918649. The next prime is 43621918693. The reversal of 43621918651 is 15681912634.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43621918651 - 2¹ = 43621918649 is a prime.

Together with 43621918649, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (43621918751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21810959325 + 21810959326.

It is an arithmetic number, because the mean of its divisors is an integer number (21810959326).

Almost surely, 2^43621918651 is an apocalyptic number.

43621918651 is a deficient number, since it is larger than the sum of its proper divisors (1).

43621918651 is an equidigital number, since it uses as much as digits as its factorization.

43621918651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 46.

The spelling of 43621918651 in words is "forty-three billion, six hundred twenty-one million, nine hundred eighteen thousand, six hundred fifty-one".