38640265117 has 2 divisors, whose sum is σ = 38640265118. Its totient is φ = 38640265116.

The previous prime is 38640265087. The next prime is 38640265133. The reversal of 38640265117 is 71156204683.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36884738916 + 1755526201 = 192054^2 + 41899^2 .

It is a cyclic number.

It is not a de Polignac number, because 38640265117 - 2⁷ = 38640264989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38640265717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19320132558 + 19320132559.

It is an arithmetic number, because the mean of its divisors is an integer number (19320132559).

Almost surely, 2^38640265117 is an apocalyptic number.

It is an amenable number.

38640265117 is a deficient number, since it is larger than the sum of its proper divisors (1).

38640265117 is an equidigital number, since it uses as much as digits as its factorization.

38640265117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 38640265117 in words is "thirty-eight billion, six hundred forty million, two hundred sixty-five thousand, one hundred seventeen".