2653166821 has 8 divisors (see below), whose sum is σ = 2793682080. Its totient is φ = 2512739088.

The previous prime is 2653166777. The next prime is 2653166827. The reversal of 2653166821 is 1286613562.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2653166821 - 2²⁷ = 2518949093 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 (2653166827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45735 + ... + 86011.

It is an arithmetic number, because the mean of its divisors is an integer number (349210260).

Almost surely, 2^2653166821 is an apocalyptic number.

It is an amenable number.

2653166821 is a deficient number, since it is larger than the sum of its proper divisors (140515259).

2653166821 is a wasteful number, since it uses less digits than its factorization.

2653166821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43763.

The product of its digits is 103680, while the sum is 40.

The square root of 2653166821 is about 51508.9004056580. The cubic root of 2653166821 is about 1384.3785211901.

The spelling of 2653166821 in words is "two billion, six hundred fifty-three million, one hundred sixty-six thousand, eight hundred twenty-one".