43787881663 has 2 divisors, whose sum is σ = 43787881664. Its totient is φ = 43787881662.

The previous prime is 43787881661. The next prime is 43787881721. The reversal of 43787881663 is 36618878734.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43787881663 - 2¹ = 43787881661 is a prime.

Together with 43787881661, 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 (43787881661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21893940831 + 21893940832.

It is an arithmetic number, because the mean of its divisors is an integer number (21893940832).

Almost surely, 2^43787881663 is an apocalyptic number.

43787881663 is a deficient number, since it is larger than the sum of its proper divisors (1).

43787881663 is an equidigital number, since it uses as much as digits as its factorization.

43787881663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32514048, while the sum is 61.

The spelling of 43787881663 in words is "forty-three billion, seven hundred eighty-seven million, eight hundred eighty-one thousand, six hundred sixty-three".