10664613221 has 4 divisors (see below), whose sum is σ = 10698255852. Its totient is φ = 10630970592.

The previous prime is 10664613209. The next prime is 10664613229. The reversal of 10664613221 is 12231646601.

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 2453716225 + 8210896996 = 49535^2 + 90614^2 .

It is a cyclic number.

It is not a de Polignac number, because 10664613221 - 2³⁰ = 9590871397 is a prime.

It is a super-2 number, since 2×10664613221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10664613229) 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, 16820840 + ... + 16821473.

It is an arithmetic number, because the mean of its divisors is an integer number (2674563963).

Almost surely, 2^10664613221 is an apocalyptic number.

It is an amenable number.

10664613221 is a deficient number, since it is larger than the sum of its proper divisors (33642631).

10664613221 is an equidigital number, since it uses as much as digits as its factorization.

10664613221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33642630.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 10664613221 in words is "ten billion, six hundred sixty-four million, six hundred thirteen thousand, two hundred twenty-one".