43620563660381 has 2 divisors, whose sum is σ = 43620563660382. Its totient is φ = 43620563660380.

The previous prime is 43620563660351. The next prime is 43620563660533. The reversal of 43620563660381 is 18306636502634.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34146842860900 + 9473720799481 = 5843530^2 + 3077941^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43620563660381 is a prime.

It is a super-2 number, since 2×43620563660381² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43620563660351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21810281830190 + 21810281830191.

It is an arithmetic number, because the mean of its divisors is an integer number (21810281830191).

Almost surely, 2^{43620563660381} is an apocalyptic number.

It is an amenable number.

43620563660381 is a deficient number, since it is larger than the sum of its proper divisors (1).

43620563660381 is an equidigital number, since it uses as much as digits as its factorization.

43620563660381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11197440, while the sum is 53.

The spelling of 43620563660381 in words is "forty-three trillion, six hundred twenty billion, five hundred sixty-three million, six hundred sixty thousand, three hundred eighty-one".