40564636369 has 2 divisors, whose sum is σ = 40564636370. Its totient is φ = 40564636368.

The previous prime is 40564636361. The next prime is 40564636381. The reversal of 40564636369 is 96363646504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40298555025 + 266081344 = 200745^2 + 16312^2 .

It is a cyclic number.

It is not a de Polignac number, because 40564636369 - 2³ = 40564636361 is a prime.

It is a super-2 number, since 2×40564636369² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40564636361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20282318184 + 20282318185.

It is an arithmetic number, because the mean of its divisors is an integer number (20282318185).

Almost surely, 2^40564636369 is an apocalyptic number.

It is an amenable number.

40564636369 is a deficient number, since it is larger than the sum of its proper divisors (1).

40564636369 is an equidigital number, since it uses as much as digits as its factorization.

40564636369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8398080, while the sum is 52.

The spelling of 40564636369 in words is "forty billion, five hundred sixty-four million, six hundred thirty-six thousand, three hundred sixty-nine".