6404236266641 has 4 divisors (see below), whose sum is σ = 6509223746484. Its totient is φ = 6299248786800.

The previous prime is 6404236266569. The next prime is 6404236266697. The reversal of 6404236266641 is 1466626324046.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2786362177600 + 3617874089041 = 1669240^2 + 1902071^2 .

It is a cyclic number.

It is not a de Polignac number, because 6404236266641 - 2¹⁰ = 6404236265617 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6404236266641.

It is not an unprimeable number, because it can be changed into a prime (6404236266941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52493739830 + ... + 52493739951.

It is an arithmetic number, because the mean of its divisors is an integer number (1627305936621).

Almost surely, 2^{6404236266641} is an apocalyptic number.

6404236266641 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

6404236266641 is a deficient number, since it is larger than the sum of its proper divisors (104987479843).

6404236266641 is a wasteful number, since it uses less digits than its factorization.

6404236266641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104987479842.

The product of its (nonzero) digits is 5971968, while the sum is 50.

The spelling of 6404236266641 in words is "six trillion, four hundred four billion, two hundred thirty-six million, two hundred sixty-six thousand, six hundred forty-one".