40401872509 has 2 divisors, whose sum is σ = 40401872510. Its totient is φ = 40401872508.

The previous prime is 40401872507. The next prime is 40401872527. The reversal of 40401872509 is 90527810404.

40401872509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31780192900 + 8621679609 = 178270^2 + 92853^2 .

It is a cyclic number.

It is not a de Polignac number, because 40401872509 - 2¹ = 40401872507 is a prime.

It is a super-2 number, since 2×40401872509² (a number of 22 digits) contains 22 as substring.

Together with 40401872507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40401872501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20200936254 + 20200936255.

It is an arithmetic number, because the mean of its divisors is an integer number (20200936255).

Almost surely, 2^40401872509 is an apocalyptic number.

It is an amenable number.

40401872509 is a deficient number, since it is larger than the sum of its proper divisors (1).

40401872509 is an equidigital number, since it uses as much as digits as its factorization.

40401872509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 40401872509 in words is "forty billion, four hundred one million, eight hundred seventy-two thousand, five hundred nine".