43621664164 has 81 divisors (see below), whose sum is σ = 85920637257. Its totient is φ = 19368655488.

The previous prime is 43621664153. The next prime is 43621664171. The reversal of 43621664164 is 46146612634.

The square root of 43621664164 is 208858.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 43454737764 + 166926400 = 208458^2 + 12920^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 43621664164.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 157478794 + ... + 157479070.

Almost surely, 2^43621664164 is an apocalyptic number.

43621664164 is the 208858-th square number.

It is an amenable number.

43621664164 is a deficient number, since it is larger than the sum of its proper divisors (42298973093).

43621664164 is a wasteful number, since it uses less digits than its factorization.

43621664164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642 (or 321 counting only the distinct ones).

The product of its digits is 497664, while the sum is 43.

The spelling of 43621664164 in words is "forty-three billion, six hundred twenty-one million, six hundred sixty-four thousand, one hundred sixty-four".