3856686738385 has 8 divisors (see below), whose sum is σ = 4984025938920. Its totient is φ = 2848014822144.

The previous prime is 3856686738353. The next prime is 3856686738389. The reversal of 3856686738385 is 5838376866583.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 236499361344 + 3620187377041 = 486312^2 + 1902679^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3856686738385 - 2⁵ = 3856686738353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3856686738389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29666821000 + ... + 29666821129.

It is an arithmetic number, because the mean of its divisors is an integer number (623003242365).

Almost surely, 2^{3856686738385} is an apocalyptic number.

It is an amenable number.

3856686738385 is a deficient number, since it is larger than the sum of its proper divisors (1127339200535).

3856686738385 is a wasteful number, since it uses less digits than its factorization.

3856686738385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59333642147.

The product of its digits is 4180377600, while the sum is 76.

The spelling of 3856686738385 in words is "three trillion, eight hundred fifty-six billion, six hundred eighty-six million, seven hundred thirty-eight thousand, three hundred eighty-five".