381385794985 has 16 divisors (see below), whose sum is σ = 499619416464. Its totient is φ = 277780672512.

The previous prime is 381385794983. The next prime is 381385794991. The reversal of 381385794985 is 589497583183.

It can be written as a sum of positive squares in 8 ways, for example, as 59393101849 + 321992693136 = 243707^2 + 567444^2 .

It is a cyclic number.

It is not a de Polignac number, because 381385794985 - 2¹ = 381385794983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381385794983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40183432 + ... + 40192921.

It is an arithmetic number, because the mean of its divisors is an integer number (31226213529).

Almost surely, 2^381385794985 is an apocalyptic number.

It is an amenable number.

381385794985 is a deficient number, since it is larger than the sum of its proper divisors (118233621479).

381385794985 is a wasteful number, since it uses less digits than its factorization.

381385794985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80376444.

The product of its digits is 261273600, while the sum is 70.

The spelling of 381385794985 in words is "three hundred eighty-one billion, three hundred eighty-five million, seven hundred ninety-four thousand, nine hundred eighty-five".