642236384417 has 4 divisors (see below), whose sum is σ = 642540619776. Its totient is φ = 641932149060.

The previous prime is 642236384407. The next prime is 642236384429. The reversal of 642236384417 is 714483632246.

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 642236384417 - 2⁴ = 642236384401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642236384407) 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, 152114513 + ... + 152118734.

It is an arithmetic number, because the mean of its divisors is an integer number (160635154944).

Almost surely, 2^642236384417 is an apocalyptic number.

It is an amenable number.

642236384417 is a deficient number, since it is larger than the sum of its proper divisors (304235359).

642236384417 is a wasteful number, since it uses less digits than its factorization.

642236384417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304235358.

The product of its digits is 4644864, while the sum is 50.

The spelling of 642236384417 in words is "six hundred forty-two billion, two hundred thirty-six million, three hundred eighty-four thousand, four hundred seventeen".