38918564765 has 4 divisors (see below), whose sum is σ = 46702277724. Its totient is φ = 31134851808.

The previous prime is 38918564761. The next prime is 38918564801. The reversal of 38918564765 is 56746581983.

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 29102312836 + 9816251929 = 170594^2 + 99077^2 .

It is a cyclic number.

It is not a de Polignac number, because 38918564765 - 2² = 38918564761 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 38918564698 and 38918564707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38918564761) 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, 3891856472 + ... + 3891856481.

It is an arithmetic number, because the mean of its divisors is an integer number (11675569431).

Almost surely, 2^38918564765 is an apocalyptic number.

It is an amenable number.

38918564765 is a deficient number, since it is larger than the sum of its proper divisors (7783712959).

38918564765 is an equidigital number, since it uses as much as digits as its factorization.

38918564765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7783712958.

The product of its digits is 43545600, while the sum is 62.

The spelling of 38918564765 in words is "thirty-eight billion, nine hundred eighteen million, five hundred sixty-four thousand, seven hundred sixty-five".