40187271643 has 2 divisors, whose sum is σ = 40187271644. Its totient is φ = 40187271642.

The previous prime is 40187271581. The next prime is 40187271647. The reversal of 40187271643 is 34617278104.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40187271643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40187271643.

It is not a weakly prime, because it can be changed into another prime (40187271647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20093635821 + 20093635822.

It is an arithmetic number, because the mean of its divisors is an integer number (20093635822).

Almost surely, 2^40187271643 is an apocalyptic number.

40187271643 is a deficient number, since it is larger than the sum of its proper divisors (1).

40187271643 is an equidigital number, since it uses as much as digits as its factorization.

40187271643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225792, while the sum is 43.

The spelling of 40187271643 in words is "forty billion, one hundred eighty-seven million, two hundred seventy-one thousand, six hundred forty-three".