6604400042 has 4 divisors (see below), whose sum is σ = 9906600066. Its totient is φ = 3302200020.

The previous prime is 6604400039. The next prime is 6604400051. The reversal of 6604400042 is 2400044066.

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., 6195106681 + 409293361 = 78709^2 + 20231^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6604399984 and 6604400020.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1651100009 + ... + 1651100012.

Almost surely, 2^6604400042 is an apocalyptic number.

6604400042 is a deficient number, since it is larger than the sum of its proper divisors (3302200024).

6604400042 is a wasteful number, since it uses less digits than its factorization.

6604400042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3302200023.

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 6604400042 is about 81267.4599209302. The cubic root of 6604400042 is about 1876.1942061819.

The spelling of 6604400042 in words is "six billion, six hundred four million, four hundred thousand, forty-two".