42408808657 has 4 divisors (see below), whose sum is σ = 42415718400. Its totient is φ = 42401898916.

The previous prime is 42408808643. The next prime is 42408808691. The reversal of 42408808657 is 75680880424.

It is a happy number.

42408808657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42408808657 - 2⁷ = 42408808529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42408808627) 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, 3445657 + ... + 3457942.

It is an arithmetic number, because the mean of its divisors is an integer number (10603929600).

Almost surely, 2^42408808657 is an apocalyptic number.

It is an amenable number.

42408808657 is a deficient number, since it is larger than the sum of its proper divisors (6909743).

42408808657 is an equidigital number, since it uses as much as digits as its factorization.

42408808657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6909742.

The product of its (nonzero) digits is 3440640, while the sum is 52.

The spelling of 42408808657 in words is "forty-two billion, four hundred eight million, eight hundred eight thousand, six hundred fifty-seven".