42420666443 has 4 divisors (see below), whose sum is σ = 42421872888. Its totient is φ = 42419460000.

The previous prime is 42420666433. The next prime is 42420666479. The reversal of 42420666443 is 34466602424.

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

It is a cyclic number.

It is not a de Polignac number, because 42420666443 - 2⁸ = 42420666187 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 42420666443.

It is not an unprimeable number, because it can be changed into a prime (42420666413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 548846 + ... + 621347.

It is an arithmetic number, because the mean of its divisors is an integer number (10605468222).

Almost surely, 2^42420666443 is an apocalyptic number.

42420666443 is a deficient number, since it is larger than the sum of its proper divisors (1206445).

42420666443 is a wasteful number, since it uses less digits than its factorization.

42420666443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1206444.

The product of its (nonzero) digits is 663552, while the sum is 41.

The spelling of 42420666443 in words is "forty-two billion, four hundred twenty million, six hundred sixty-six thousand, four hundred forty-three".