6404266642 has 4 divisors (see below), whose sum is σ = 9606399966. Its totient is φ = 3202133320.

The previous prime is 6404266633. The next prime is 6404266643. The reversal of 6404266642 is 2466624046.

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

It can be written as a sum of positive squares in only one way, i.e., 5953511281 + 450755361 = 77159^2 + 21231^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6404266595 and 6404266604.

It is not an unprimeable number, because it can be changed into a prime (6404266643) 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 as a sum of consecutive naturals, namely, 1601066659 + ... + 1601066662.

Almost surely, 2^6404266642 is an apocalyptic number.

6404266642 is a deficient number, since it is larger than the sum of its proper divisors (3202133324).

6404266642 is a wasteful number, since it uses less digits than its factorization.

6404266642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3202133323.

The product of its (nonzero) digits is 331776, while the sum is 40.

The square root of 6404266642 is about 80026.6620695878. The cubic root of 6404266642 is about 1857.0480250832.

The spelling of 6404266642 in words is "six billion, four hundred four million, two hundred sixty-six thousand, six hundred forty-two".