43662361997 has 2 divisors, whose sum is σ = 43662361998. Its totient is φ = 43662361996.

The previous prime is 43662361987. The next prime is 43662361999. The reversal of 43662361997 is 79916326634.

43662361997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24495067081 + 19167294916 = 156509^2 + 138446^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43662361997 is a prime.

Together with 43662361999, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43662361999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21831180998 + 21831180999.

It is an arithmetic number, because the mean of its divisors is an integer number (21831180999).

Almost surely, 2^43662361997 is an apocalyptic number.

It is an amenable number.

43662361997 is a deficient number, since it is larger than the sum of its proper divisors (1).

43662361997 is an equidigital number, since it uses as much as digits as its factorization.

43662361997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8817984, while the sum is 56.

The spelling of 43662361997 in words is "forty-three billion, six hundred sixty-two million, three hundred sixty-one thousand, nine hundred ninety-seven".