40564372729 has 2 divisors, whose sum is σ = 40564372730. Its totient is φ = 40564372728.

The previous prime is 40564372727. The next prime is 40564372811. The reversal of 40564372729 is 92727346504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38998350400 + 1566022329 = 197480^2 + 39573^2 .

It is a cyclic number.

It is not a de Polignac number, because 40564372729 - 2¹ = 40564372727 is a prime.

Together with 40564372727, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40564372727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20282186364 + 20282186365.

It is an arithmetic number, because the mean of its divisors is an integer number (20282186365).

Almost surely, 2^40564372729 is an apocalyptic number.

It is an amenable number.

40564372729 is a deficient number, since it is larger than the sum of its proper divisors (1).

40564372729 is an equidigital number, since it uses as much as digits as its factorization.

40564372729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2540160, while the sum is 49.

The spelling of 40564372729 in words is "forty billion, five hundred sixty-four million, three hundred seventy-two thousand, seven hundred twenty-nine".