43640613629 has 2 divisors, whose sum is σ = 43640613630. Its totient is φ = 43640613628.

The previous prime is 43640613607. The next prime is 43640613641. The reversal of 43640613629 is 92631604634.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35354152729 + 8286460900 = 188027^2 + 91030^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43640613629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43640613629.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43640613659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21820306814 + 21820306815.

It is an arithmetic number, because the mean of its divisors is an integer number (21820306815).

Almost surely, 2^43640613629 is an apocalyptic number.

It is an amenable number.

43640613629 is a deficient number, since it is larger than the sum of its proper divisors (1).

43640613629 is an equidigital number, since it uses as much as digits as its factorization.

43640613629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 44.

The spelling of 43640613629 in words is "forty-three billion, six hundred forty million, six hundred thirteen thousand, six hundred twenty-nine".