4664636621 has 4 divisors (see below), whose sum is σ = 4710821244. Its totient is φ = 4618452000.

The previous prime is 4664636617. The next prime is 4664636651. The reversal of 4664636621 is 1266364664.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2793122500 + 1871514121 = 52850^2 + 43261^2 .

It is a cyclic number.

It is not a de Polignac number, because 4664636621 - 2² = 4664636617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4664636651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23092160 + ... + 23092361.

It is an arithmetic number, because the mean of its divisors is an integer number (1177705311).

Almost surely, 2^4664636621 is an apocalyptic number.

It is an amenable number.

4664636621 is a deficient number, since it is larger than the sum of its proper divisors (46184623).

4664636621 is a wasteful number, since it uses less digits than its factorization.

4664636621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46184622.

The product of its digits is 746496, while the sum is 44.

The square root of 4664636621 is about 68298.1450773006. The cubic root of 4664636621 is about 1670.8569616588.

The spelling of 4664636621 in words is "four billion, six hundred sixty-four million, six hundred thirty-six thousand, six hundred twenty-one".