642816334245 has 8 divisors (see below), whose sum is σ = 1028506134816. Its totient is φ = 342835378256.

The previous prime is 642816334241. The next prime is 642816334327. The reversal of 642816334245 is 542433618246.

It is a happy number.

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 642816334245 - 2² = 642816334241 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 642816334194 and 642816334203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642816334241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21427211127 + ... + 21427211156.

It is an arithmetic number, because the mean of its divisors is an integer number (128563266852).

Almost surely, 2^642816334245 is an apocalyptic number.

It is an amenable number.

642816334245 is a deficient number, since it is larger than the sum of its proper divisors (385689800571).

642816334245 is a wasteful number, since it uses less digits than its factorization.

642816334245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42854422291.

The product of its digits is 3317760, while the sum is 48.

The spelling of 642816334245 in words is "six hundred forty-two billion, eight hundred sixteen million, three hundred thirty-four thousand, two hundred forty-five".