40444634081 has 2 divisors, whose sum is σ = 40444634082. Its totient is φ = 40444634080.

The previous prime is 40444634017. The next prime is 40444634147. The reversal of 40444634081 is 18043644404.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29349171856 + 11095462225 = 171316^2 + 105335^2 .

It is a cyclic number.

It is not a de Polignac number, because 40444634081 - 2⁶ = 40444634017 is a prime.

It is a super-2 number, since 2×40444634081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40444634381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20222317040 + 20222317041.

It is an arithmetic number, because the mean of its divisors is an integer number (20222317041).

Almost surely, 2^40444634081 is an apocalyptic number.

It is an amenable number.

40444634081 is a deficient number, since it is larger than the sum of its proper divisors (1).

40444634081 is an equidigital number, since it uses as much as digits as its factorization.

40444634081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 147456, while the sum is 38.

The spelling of 40444634081 in words is "forty billion, four hundred forty-four million, six hundred thirty-four thousand, eighty-one".