3818561986 has 8 divisors (see below), whose sum is σ = 5882649660. Its totient is φ = 1857678768.

The previous prime is 3818561983. The next prime is 3818561987. The reversal of 3818561986 is 6891658183.

It can be written as a sum of positive squares in 2 ways, for example, as 2935580761 + 882981225 = 54181^2 + 29715^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (3818561983) 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, 25801021 + ... + 25801168.

Almost surely, 2^3818561986 is an apocalyptic number.

3818561986 is a deficient number, since it is larger than the sum of its proper divisors (2064087674).

3818561986 is a wasteful number, since it uses less digits than its factorization.

3818561986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51602228.

The product of its digits is 2488320, while the sum is 55.

The square root of 3818561986 is about 61794.5142063598. The cubic root of 3818561986 is about 1563.0274850612.

The spelling of 3818561986 in words is "three billion, eight hundred eighteen million, five hundred sixty-one thousand, nine hundred eighty-six".