385831977578 has 4 divisors (see below), whose sum is σ = 578747966370. Its totient is φ = 192915988788.

The previous prime is 385831977571. The next prime is 385831977617. The reversal of 385831977578 is 875779138583.

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

It can be written as a sum of positive squares in only one way, i.e., 317202124849 + 68629852729 = 563207^2 + 261973^2 .

It is not an unprimeable number, because it can be changed into a prime (385831977571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96457994393 + ... + 96457994396.

Almost surely, 2^385831977578 is an apocalyptic number.

385831977578 is a deficient number, since it is larger than the sum of its proper divisors (192915988792).

385831977578 is a wasteful number, since it uses less digits than its factorization.

385831977578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192915988791.

The product of its digits is 355622400, while the sum is 71.

The spelling of 385831977578 in words is "three hundred eighty-five billion, eight hundred thirty-one million, nine hundred seventy-seven thousand, five hundred seventy-eight".