3662621621 has 16 divisors (see below), whose sum is σ = 3995059200. Its totient is φ = 3346198128.

The previous prime is 3662621617. The next prime is 3662621689. The reversal of 3662621621 is 1261262663.

It is a happy number.

3662621621 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 3662621621 - 2² = 3662621617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3662623621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36170 + ... + 92916.

It is an arithmetic number, because the mean of its divisors is an integer number (249691200).

Almost surely, 2^3662621621 is an apocalyptic number.

It is an amenable number.

3662621621 is a deficient number, since it is larger than the sum of its proper divisors (332437579).

3662621621 is a wasteful number, since it uses less digits than its factorization.

3662621621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56888.

The product of its digits is 31104, while the sum is 35.

The square root of 3662621621 is about 60519.5969996496. The cubic root of 3662621621 is about 1541.4544112528.

The spelling of 3662621621 in words is "three billion, six hundred sixty-two million, six hundred twenty-one thousand, six hundred twenty-one".