40439177843663 has 2 divisors, whose sum is σ = 40439177843664. Its totient is φ = 40439177843662.

The previous prime is 40439177843633. The next prime is 40439177843711. The reversal of 40439177843663 is 36634877193404.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40439177843663 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40439177843663.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40439177843633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20219588921831 + 20219588921832.

It is an arithmetic number, because the mean of its divisors is an integer number (20219588921832).

Almost surely, 2^{40439177843663} is an apocalyptic number.

40439177843663 is a deficient number, since it is larger than the sum of its proper divisors (1).

40439177843663 is an equidigital number, since it uses as much as digits as its factorization.

40439177843663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 219469824, while the sum is 65.

The spelling of 40439177843663 in words is "forty trillion, four hundred thirty-nine billion, one hundred seventy-seven million, eight hundred forty-three thousand, six hundred sixty-three".