385836565821 has 32 divisors (see below), whose sum is σ = 600005280000. Its totient is φ = 220454136000.

The previous prime is 385836565819. The next prime is 385836565831. The reversal of 385836565821 is 128565638583.

It is a happy number.

It is not a de Polignac number, because 385836565821 - 2¹ = 385836565819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385836565801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14546071 + ... + 14572571.

It is an arithmetic number, because the mean of its divisors is an integer number (18750165000).

Almost surely, 2^385836565821 is an apocalyptic number.

It is an amenable number.

385836565821 is a deficient number, since it is larger than the sum of its proper divisors (214168714179).

385836565821 is a wasteful number, since it uses less digits than its factorization.

385836565821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40674 (or 40660 counting only the distinct ones).

The product of its digits is 41472000, while the sum is 60.

The spelling of 385836565821 in words is "three hundred eighty-five billion, eight hundred thirty-six million, five hundred sixty-five thousand, eight hundred twenty-one".