40863171521 has 2 divisors, whose sum is σ = 40863171522. Its totient is φ = 40863171520.

The previous prime is 40863171509. The next prime is 40863171577. The reversal of 40863171521 is 12517136804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38050354225 + 2812817296 = 195065^2 + 53036^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40863171521 is a prime.

It is not a weakly prime, because it can be changed into another prime (40863171121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20431585760 + 20431585761.

It is an arithmetic number, because the mean of its divisors is an integer number (20431585761).

Almost surely, 2^40863171521 is an apocalyptic number.

It is an amenable number.

40863171521 is a deficient number, since it is larger than the sum of its proper divisors (1).

40863171521 is an equidigital number, since it uses as much as digits as its factorization.

40863171521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 38.

The spelling of 40863171521 in words is "forty billion, eight hundred sixty-three million, one hundred seventy-one thousand, five hundred twenty-one".