385813565440 has 52 divisors (see below), whose sum is σ = 925839574884. Its totient is φ = 154325417984.

The previous prime is 385813565411. The next prime is 385813565447. The reversal of 385813565440 is 44565318583.

It can be written as a sum of positive squares in 2 ways, for example, as 206363049984 + 179450515456 = 454272^2 + 423616^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385813565447) 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, 9398797 + ... + 9439756.

Almost surely, 2^385813565440 is an apocalyptic number.

It is an amenable number.

385813565440 is an abundant number, since it is smaller than the sum of its proper divisors (540026009444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

385813565440 is an equidigital number, since it uses as much as digits as its factorization.

385813565440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18838582 (or 18838560 counting only the distinct ones).

The product of its (nonzero) digits is 6912000, while the sum is 52.

The spelling of 385813565440 in words is "three hundred eighty-five billion, eight hundred thirteen million, five hundred sixty-five thousand, four hundred forty".