10664131165621 has 4 divisors (see below), whose sum is σ = 10952350926892. Its totient is φ = 10375911404352.

The previous prime is 10664131165591. The next prime is 10664131165679. The reversal of 10664131165621 is 12656113146601.

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 9968158103121 + 695973062500 = 3157239^2 + 834250^2 .

It is a cyclic number.

It is not a de Polignac number, because 10664131165621 - 2⁹ = 10664131165109 is a prime.

It is a super-2 number, since 2×10664131165621² (a number of 27 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 (10664131165321) 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, 144109880580 + ... + 144109880653.

It is an arithmetic number, because the mean of its divisors is an integer number (2738087731723).

Almost surely, 2^{10664131165621} is an apocalyptic number.

It is an amenable number.

10664131165621 is a deficient number, since it is larger than the sum of its proper divisors (288219761271).

10664131165621 is an equidigital number, since it uses as much as digits as its factorization.

10664131165621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288219761270.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 10664131165621 in words is "ten trillion, six hundred sixty-four billion, one hundred thirty-one million, one hundred sixty-five thousand, six hundred twenty-one".