3661804818 has 48 divisors (see below), whose sum is σ = 9070766016. Its totient is φ = 1045833120.

The previous prime is 3661804781. The next prime is 3661804819. The reversal of 3661804818 is 8184081663.

It is a happy number.

3661804818 is a `hidden beast` number, since 36 + 61 + 80 + 481 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (3661804819) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 546408 + ... + 553068.

It is an arithmetic number, because the mean of its divisors is an integer number (188974292).

Almost surely, 2^3661804818 is an apocalyptic number.

3661804818 is an abundant number, since it is smaller than the sum of its proper divisors (5408961198).

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

3661804818 is a wasteful number, since it uses less digits than its factorization.

3661804818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11039 (or 11036 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The square root of 3661804818 is about 60512.8483712344. The cubic root of 3661804818 is about 1541.3398159052.

The spelling of 3661804818 in words is "three billion, six hundred sixty-one million, eight hundred four thousand, eight hundred eighteen".