385477778813 has 4 divisors (see below), whose sum is σ = 385691816028. Its totient is φ = 385263741600.

The previous prime is 385477778797. The next prime is 385477778893. The reversal of 385477778813 is 318877774583.

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 16132302169 + 369345476644 = 127013^2 + 607738^2 .

It is a cyclic number.

It is not a de Polignac number, because 385477778813 - 2⁴ = 385477778797 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 (385477778893) 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, 107015906 + ... + 107019507.

It is an arithmetic number, because the mean of its divisors is an integer number (96422954007).

Almost surely, 2^385477778813 is an apocalyptic number.

It is an amenable number.

385477778813 is a deficient number, since it is larger than the sum of its proper divisors (214037215).

385477778813 is a wasteful number, since it uses less digits than its factorization.

385477778813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214037214.

The product of its digits is 221276160, while the sum is 68.

The spelling of 385477778813 in words is "three hundred eighty-five billion, four hundred seventy-seven million, seven hundred seventy-eight thousand, eight hundred thirteen".