6404626845 has 12 divisors (see below), whose sum is σ = 11101353276. Its totient is φ = 3415800960.

The previous prime is 6404626843. The next prime is 6404626849. The reversal of 6404626845 is 5486264046.

It can be written as a sum of positive squares in 2 ways, for example, as 1422949284 + 4981677561 = 37722^2 + 70581^2 .

It is not a de Polignac number, because 6404626845 - 2¹ = 6404626843 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 142325041 = 6404626845 / (6 + 4 + 0 + 4 + 6 + 2 + 6 + 8 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 6404626845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6404626841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71162476 + ... + 71162565.

It is an arithmetic number, because the mean of its divisors is an integer number (925112773).

Almost surely, 2^6404626845 is an apocalyptic number.

It is an amenable number.

6404626845 is a deficient number, since it is larger than the sum of its proper divisors (4696726431).

6404626845 is a wasteful number, since it uses less digits than its factorization.

6404626845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142325052 (or 142325049 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 45.

The square root of 6404626845 is about 80028.9125566504. The cubic root of 6404626845 is about 1857.0828405048.

The spelling of 6404626845 in words is "six billion, four hundred four million, six hundred twenty-six thousand, eight hundred forty-five".