38645927809 has 2 divisors, whose sum is σ = 38645927810. Its totient is φ = 38645927808.

The previous prime is 38645927779. The next prime is 38645927843. The reversal of 38645927809 is 90872954683.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37968471025 + 677456784 = 194855^2 + 26028^2 .

It is a cyclic number.

It is not a de Polignac number, because 38645927809 - 2⁷ = 38645927681 is a prime.

It is not a weakly prime, because it can be changed into another prime (38645927009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19322963904 + 19322963905.

It is an arithmetic number, because the mean of its divisors is an integer number (19322963905).

Almost surely, 2^38645927809 is an apocalyptic number.

It is an amenable number.

38645927809 is a deficient number, since it is larger than the sum of its proper divisors (1).

38645927809 is an equidigital number, since it uses as much as digits as its factorization.

38645927809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26127360, while the sum is 61.

The spelling of 38645927809 in words is "thirty-eight billion, six hundred forty-five million, nine hundred twenty-seven thousand, eight hundred nine".