2646506821 has 8 divisors (see below), whose sum is σ = 3024891200. Its totient is φ = 2268200448.

The previous prime is 2646506809. The next prime is 2646506831. The reversal of 2646506821 is 1286056462.

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 2646506821 - 2⁹ = 2646506309 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 (2646506831) 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, 115870 + ... + 136816.

It is an arithmetic number, because the mean of its divisors is an integer number (378111400).

Almost surely, 2^2646506821 is an apocalyptic number.

It is an amenable number.

2646506821 is a deficient number, since it is larger than the sum of its proper divisors (378384379).

2646506821 is a wasteful number, since it uses less digits than its factorization.

2646506821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39003.

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 2646506821 is about 51444.2107627282. The cubic root of 2646506821 is about 1383.2191913499.

The spelling of 2646506821 in words is "two billion, six hundred forty-six million, five hundred six thousand, eight hundred twenty-one".