4661221636 has 12 divisors (see below), whose sum is σ = 8636969628. Its totient is φ = 2193516032.

The previous prime is 4661221603. The next prime is 4661221657. The reversal of 4661221636 is 6361221664.

It can be written as a sum of positive squares in 2 ways, for example, as 2012060736 + 2649160900 = 44856^2 + 51470^2 .

It is a junction number, because it is equal to n+sod(n) for n = 4661221595 and 4661221604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34273621 + ... + 34273756.

It is an arithmetic number, because the mean of its divisors is an integer number (719747469).

Almost surely, 2^4661221636 is an apocalyptic number.

It is an amenable number.

4661221636 is a deficient number, since it is larger than the sum of its proper divisors (3975747992).

4661221636 is a wasteful number, since it uses less digits than its factorization.

4661221636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68547398 (or 68547396 counting only the distinct ones).

The product of its digits is 62208, while the sum is 37.

The square root of 4661221636 is about 68273.1399307224. The cubic root of 4661221636 is about 1670.4491167800.

The spelling of 4661221636 in words is "four billion, six hundred sixty-one million, two hundred twenty-one thousand, six hundred thirty-six".