642442526617 has 8 divisors (see below), whose sum is σ = 665325267840. Its totient is φ = 619608422160.

The previous prime is 642442526591. The next prime is 642442526623. The reversal of 642442526617 is 716625244246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 642442526617 - 2³¹ = 640295042969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642442526017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12132303 + ... + 12185140.

It is an arithmetic number, because the mean of its divisors is an integer number (83165658480).

Almost surely, 2^642442526617 is an apocalyptic number.

It is an amenable number.

642442526617 is a deficient number, since it is larger than the sum of its proper divisors (22882741223).

642442526617 is a wasteful number, since it uses less digits than its factorization.

642442526617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24318383.

The product of its digits is 3870720, while the sum is 49.

The spelling of 642442526617 in words is "six hundred forty-two billion, four hundred forty-two million, five hundred twenty-six thousand, six hundred seventeen".