43661005999453 has 2 divisors, whose sum is σ = 43661005999454. Its totient is φ = 43661005999452.

The previous prime is 43661005999451. The next prime is 43661005999459. The reversal of 43661005999453 is 35499950016634.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40443011308324 + 3217994691129 = 6359482^2 + 1793877^2 .

It is a cyclic number.

It is not a de Polignac number, because 43661005999453 - 2¹ = 43661005999451 is a prime.

Together with 43661005999451, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43661005999451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21830502999726 + 21830502999727.

It is an arithmetic number, because the mean of its divisors is an integer number (21830502999727).

Almost surely, 2^{43661005999453} is an apocalyptic number.

It is an amenable number.

43661005999453 is a deficient number, since it is larger than the sum of its proper divisors (1).

43661005999453 is an equidigital number, since it uses as much as digits as its factorization.

43661005999453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 94478400, while the sum is 64.

The spelling of 43661005999453 in words is "forty-three trillion, six hundred sixty-one billion, five million, nine hundred ninety-nine thousand, four hundred fifty-three".