6621340045 has 4 divisors (see below), whose sum is σ = 7945608060. Its totient is φ = 5297072032.

The previous prime is 6621340021. The next prime is 6621340093. The reversal of 6621340045 is 5400431266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5400431266 = 2 ⋅2700215633.

It can be written as a sum of positive squares in 2 ways, for example, as 2481833124 + 4139506921 = 49818^2 + 64339^2 .

It is a cyclic number.

It is not a de Polignac number, because 6621340045 - 2⁹ = 6621339533 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6621339989 and 6621340016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 662134000 + ... + 662134009.

It is an arithmetic number, because the mean of its divisors is an integer number (1986402015).

Almost surely, 2^6621340045 is an apocalyptic number.

It is an amenable number.

6621340045 is a deficient number, since it is larger than the sum of its proper divisors (1324268015).

6621340045 is a wasteful number, since it uses less digits than its factorization.

6621340045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324268014.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 6621340045 is about 81371.6169496465. The cubic root of 6621340045 is about 1877.7969558715.

The spelling of 6621340045 in words is "six billion, six hundred twenty-one million, three hundred forty thousand, forty-five".