42408435778 has 4 divisors (see below), whose sum is σ = 63612653670. Its totient is φ = 21204217888.

The previous prime is 42408435697. The next prime is 42408435787. The reversal of 42408435778 is 87753480424.

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., 42068881449 + 339554329 = 205107^2 + 18427^2 .

It is an unprimeable number.

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, 10602108943 + ... + 10602108946.

Almost surely, 2^42408435778 is an apocalyptic number.

42408435778 is a deficient number, since it is larger than the sum of its proper divisors (21204217892).

42408435778 is a wasteful number, since it uses less digits than its factorization.

42408435778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21204217891.

The product of its (nonzero) digits is 6021120, while the sum is 52.

The spelling of 42408435778 in words is "forty-two billion, four hundred eight million, four hundred thirty-five thousand, seven hundred seventy-eight".