40808443993 has 2 divisors, whose sum is σ = 40808443994. Its totient is φ = 40808443992.

The previous prime is 40808443981. The next prime is 40808443997. The reversal of 40808443993 is 39934480804.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37530537984 + 3277906009 = 193728^2 + 57253^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40808443993 is a prime.

It is a super-2 number, since 2×40808443993² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40808443993.

It is not a weakly prime, because it can be changed into another prime (40808443997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20404221996 + 20404221997.

It is an arithmetic number, because the mean of its divisors is an integer number (20404221997).

Almost surely, 2^40808443993 is an apocalyptic number.

It is an amenable number.

40808443993 is a deficient number, since it is larger than the sum of its proper divisors (1).

40808443993 is an equidigital number, since it uses as much as digits as its factorization.

40808443993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2985984, while the sum is 52.

The spelling of 40808443993 in words is "forty billion, eight hundred eight million, four hundred forty-three thousand, nine hundred ninety-three".