6706220645 has 18 divisors (see below), whose sum is σ = 8214055794. Its totient is φ = 5256132960.

The previous prime is 6706220641. The next prime is 6706220657. The reversal of 6706220645 is 5460226076.

It can be written as a sum of positive squares in 3 ways, for example, as 1835436964 + 4870783681 = 42842^2 + 69791^2 .

It is not a de Polignac number, because 6706220645 - 2² = 6706220641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6706220599 and 6706220608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6706220641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9704750 + ... + 9705440.

It is an arithmetic number, because the mean of its divisors is an integer number (456336433).

Almost surely, 2^6706220645 is an apocalyptic number.

It is an amenable number.

6706220645 is a deficient number, since it is larger than the sum of its proper divisors (1507835149).

6706220645 is an frugal number, since it uses more digits than its factorization.

6706220645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1493 (or 749 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 38.

The square root of 6706220645 is about 81891.5175399748. The cubic root of 6706220645 is about 1885.7868924651.

The spelling of 6706220645 in words is "six billion, seven hundred six million, two hundred twenty thousand, six hundred forty-five".