40443220997 has 2 divisors, whose sum is σ = 40443220998. Its totient is φ = 40443220996.

The previous prime is 40443220931. The next prime is 40443221047. The reversal of 40443220997 is 79902234404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39638420836 + 804800161 = 199094^2 + 28369^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40443220997 is a prime.

It is a super-2 number, since 2×40443220997² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40443220927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20221610498 + 20221610499.

It is an arithmetic number, because the mean of its divisors is an integer number (20221610499).

Almost surely, 2^40443220997 is an apocalyptic number.

It is an amenable number.

40443220997 is a deficient number, since it is larger than the sum of its proper divisors (1).

40443220997 is an equidigital number, since it uses as much as digits as its factorization.

40443220997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 44.

The spelling of 40443220997 in words is "forty billion, four hundred forty-three million, two hundred twenty thousand, nine hundred ninety-seven".