642886688245 has 8 divisors (see below), whose sum is σ = 789405050016. Its totient is φ = 502348667856.

The previous prime is 642886688233. The next prime is 642886688281. The reversal of 642886688245 is 542886688246.

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 642886688245 - 2⁷ = 642886688117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1495085107 + ... + 1495085536.

It is an arithmetic number, because the mean of its divisors is an integer number (98675631252).

Almost surely, 2^642886688245 is an apocalyptic number.

It is an amenable number.

642886688245 is a deficient number, since it is larger than the sum of its proper divisors (146518361771).

642886688245 is a wasteful number, since it uses less digits than its factorization.

642886688245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2990170691.

The product of its digits is 283115520, while the sum is 67.

Subtracting from 642886688245 its reverse (542886688246), we obtain a palindrome (99999999999).

The spelling of 642886688245 in words is "six hundred forty-two billion, eight hundred eighty-six million, six hundred eighty-eight thousand, two hundred forty-five".