43619937681781 has 2 divisors, whose sum is σ = 43619937681782. Its totient is φ = 43619937681780.

The previous prime is 43619937681757. The next prime is 43619937681797. The reversal of 43619937681781 is 18718673991634.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27350452414756 + 16269485267025 = 5229766^2 + 4033545^2 .

It is a cyclic number.

It is not a de Polignac number, because 43619937681781 - 2⁷ = 43619937681653 is a prime.

It is a super-2 number, since 2×43619937681781² (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 (43619937681751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21809968840890 + 21809968840891.

It is an arithmetic number, because the mean of its divisors is an integer number (21809968840891).

Almost surely, 2^{43619937681781} is an apocalyptic number.

It is an amenable number.

43619937681781 is a deficient number, since it is larger than the sum of its proper divisors (1).

43619937681781 is an equidigital number, since it uses as much as digits as its factorization.

43619937681781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 329204736, while the sum is 73.

The spelling of 43619937681781 in words is "forty-three trillion, six hundred nineteen billion, nine hundred thirty-seven million, six hundred eighty-one thousand, seven hundred eighty-one".