3818238561 has 16 divisors (see below), whose sum is σ = 5763381120. Its totient is φ = 2497463280.

The previous prime is 3818238551. The next prime is 3818238577. The reversal of 3818238561 is 1658328183.

3818238561 is a `hidden beast` number, since 3 + 8 + 1 + 82 + 3 + 8 + 561 = 666.

3818238561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3818238561 - 2²² = 3814044257 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (3818238551) 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, 1332685 + ... + 1335546.

It is an arithmetic number, because the mean of its divisors is an integer number (360211320).

Almost surely, 2^3818238561 is an apocalyptic number.

It is an amenable number.

3818238561 is a deficient number, since it is larger than the sum of its proper divisors (1945142559).

3818238561 is a wasteful number, since it uses less digits than its factorization.

3818238561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2668293 (or 2668287 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 3818238561 is about 61791.8972115277. The cubic root of 3818238561 is about 1562.9833553217.

The spelling of 3818238561 in words is "three billion, eight hundred eighteen million, two hundred thirty-eight thousand, five hundred sixty-one".