38648649077 has 4 divisors (see below), whose sum is σ = 39178082700. Its totient is φ = 38119215456.

The previous prime is 38648649041. The next prime is 38648649079. The reversal of 38648649077 is 77094684683.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28518427876 + 10130221201 = 168874^2 + 100649^2 .

It is a cyclic number.

It is not a de Polignac number, because 38648649077 - 2¹⁰ = 38648648053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38648649079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264716702 + ... + 264716847.

It is an arithmetic number, because the mean of its divisors is an integer number (9794520675).

Almost surely, 2^38648649077 is an apocalyptic number.

It is an amenable number.

38648649077 is a deficient number, since it is larger than the sum of its proper divisors (529433623).

38648649077 is an equidigital number, since it uses as much as digits as its factorization.

38648649077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529433622.

The product of its (nonzero) digits is 48771072, while the sum is 62.

The spelling of 38648649077 in words is "thirty-eight billion, six hundred forty-eight million, six hundred forty-nine thousand, seventy-seven".