3721855556 has 24 divisors (see below), whose sum is σ = 6541993920. Its totient is φ = 1852729632.

The previous prime is 3721855549. The next prime is 3721855559. The reversal of 3721855556 is 6555581273.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 3721855556.

It is not an unprimeable number, because it can be changed into a prime (3721855559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1979825 + ... + 1981703.

It is an arithmetic number, because the mean of its divisors is an integer number (272583080).

Almost surely, 2^3721855556 is an apocalyptic number.

It is an amenable number.

3721855556 is a deficient number, since it is larger than the sum of its proper divisors (2820138364).

3721855556 is a wasteful number, since it uses less digits than its factorization.

3721855556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3803 (or 3801 counting only the distinct ones).

The product of its digits is 1260000, while the sum is 47.

The square root of 3721855556 is about 61007.0123510404. The cubic root of 3721855556 is about 1549.7197628643.

The spelling of 3721855556 in words is "three billion, seven hundred twenty-one million, eight hundred fifty-five thousand, five hundred fifty-six".