38539945665 has 32 divisors (see below), whose sum is σ = 73785882240. Its totient is φ = 18973510848.

The previous prime is 38539945657. The next prime is 38539945673. The reversal of 38539945665 is 56654993583.

38539945665 is a `hidden beast` number, since 3 + 8 + 539 + 94 + 5 + 6 + 6 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (38539945657) and next prime (38539945673).

It is not a de Polignac number, because 38539945665 - 2³ = 38539945657 is a prime.

It is a super-3 number, since 3×38539945665³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10978287 + ... + 10981796.

It is an arithmetic number, because the mean of its divisors is an integer number (2305808820).

Almost surely, 2^38539945665 is an apocalyptic number.

It is an amenable number.

38539945665 is a deficient number, since it is larger than the sum of its proper divisors (35245936575).

38539945665 is a wasteful number, since it uses less digits than its factorization.

38539945665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21960110 (or 21960104 counting only the distinct ones).

The product of its digits is 104976000, while the sum is 63.

The spelling of 38539945665 in words is "thirty-eight billion, five hundred thirty-nine million, nine hundred forty-five thousand, six hundred sixty-five".