2164266033521 has 4 divisors (see below), whose sum is σ = 2164764831600. Its totient is φ = 2163767235444.

The previous prime is 2164266033481. The next prime is 2164266033563. The reversal of 2164266033521 is 1253306624612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2164266033521 - 2²² = 2164261839217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2164266033221) 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, 249392531 + ... + 249401208.

It is an arithmetic number, because the mean of its divisors is an integer number (541191207900).

Almost surely, 2^{2164266033521} is an apocalyptic number.

It is an amenable number.

2164266033521 is a deficient number, since it is larger than the sum of its proper divisors (498798079).

2164266033521 is an equidigital number, since it uses as much as digits as its factorization.

2164266033521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498798078.

The product of its (nonzero) digits is 311040, while the sum is 41.

The spelling of 2164266033521 in words is "two trillion, one hundred sixty-four billion, two hundred sixty-six million, thirty-three thousand, five hundred twenty-one".