3721660218 has 12 divisors (see below), whose sum is σ = 8063597178. Its totient is φ = 1240553400.

The previous prime is 3721660193. The next prime is 3721660249. The reversal of 3721660218 is 8120661273.

3721660218 is a `hidden beast` number, since 37 + 2 + 1 + 6 + 602 + 18 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2355840369 + 1365819849 = 48537^2 + 36957^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 103379433 + ... + 103379468.

Almost surely, 2^3721660218 is an apocalyptic number.

3721660218 is an abundant number, since it is smaller than the sum of its proper divisors (4341936960).

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

3721660218 is a wasteful number, since it uses less digits than its factorization.

3721660218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206758909 (or 206758906 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 3721660218 is about 61005.4113829257. The cubic root of 3721660218 is about 1549.6926505408.

The spelling of 3721660218 in words is "three billion, seven hundred twenty-one million, six hundred sixty thousand, two hundred eighteen".