43664999801 has 2 divisors, whose sum is σ = 43664999802. Its totient is φ = 43664999800.

The previous prime is 43664999761. The next prime is 43664999827. The reversal of 43664999801 is 10899946634.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30828336400 + 12836663401 = 175580^2 + 113299^2 .

It is a cyclic number.

It is not a de Polignac number, because 43664999801 - 2⁶ = 43664999737 is a prime.

It is not a weakly prime, because it can be changed into another prime (43664999881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21832499900 + 21832499901.

It is an arithmetic number, because the mean of its divisors is an integer number (21832499901).

Almost surely, 2^43664999801 is an apocalyptic number.

It is an amenable number.

43664999801 is a deficient number, since it is larger than the sum of its proper divisors (1).

43664999801 is an equidigital number, since it uses as much as digits as its factorization.

43664999801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10077696, while the sum is 59.

The spelling of 43664999801 in words is "forty-three billion, six hundred sixty-four million, nine hundred ninety-nine thousand, eight hundred one".