378863639361 has 99 divisors (see below), whose sum is σ = 607766402761. Its totient is φ = 236122936704.

The previous prime is 378863639339. The next prime is 378863639369. The reversal of 378863639361 is 163936368873.

The square root of 378863639361 is 615519.

It is a perfect power (a square), and thus also a powerful number.

378863639361 is a `hidden beast` number, since 378 + 8 + 63 + 63 + 93 + 61 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 7441650225 + 371421989136 = 86265^2 + 609444^2 .

It is not a de Polignac number, because 378863639361 - 2⁹ = 378863638849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (378863639369) by changing a digit.

It is a polite number, since it can be written in 98 ways as a sum of consecutive naturals, for example, 2542708915 + ... + 2542709063.

Almost surely, 2^378863639361 is an apocalyptic number.

378863639361 is the 615519-th square number.

378863639361 is the 307760-th centered octagonal number.

It is an amenable number.

378863639361 is a deficient number, since it is larger than the sum of its proper divisors (228902763400).

378863639361 is an frugal number, since it uses more digits than its factorization.

378863639361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362 (or 169 counting only the distinct ones).

The product of its digits is 70543872, while the sum is 63.

The spelling of 378863639361 in words is "three hundred seventy-eight billion, eight hundred sixty-three million, six hundred thirty-nine thousand, three hundred sixty-one".