40444201997 has 2 divisors, whose sum is σ = 40444201998. Its totient is φ = 40444201996.

The previous prime is 40444201979. The next prime is 40444202011. The reversal of 40444201997 is 79910244404.

It is a happy number.

Together with previous prime (40444201979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21405445636 + 19038756361 = 146306^2 + 137981^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40444201997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40444201297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20222100998 + 20222100999.

It is an arithmetic number, because the mean of its divisors is an integer number (20222100999).

Almost surely, 2^40444201997 is an apocalyptic number.

It is an amenable number.

40444201997 is a deficient number, since it is larger than the sum of its proper divisors (1).

40444201997 is an equidigital number, since it uses as much as digits as its factorization.

40444201997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 40444201997 in words is "forty billion, four hundred forty-four million, two hundred one thousand, nine hundred ninety-seven".