642204453445 has 4 divisors (see below), whose sum is σ = 770645344140. Its totient is φ = 513763562752.

The previous prime is 642204453419. The next prime is 642204453461. The reversal of 642204453445 is 544354402246.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 287586585441 + 354617868004 = 536271^2 + 595498^2 .

It is a cyclic number.

It is not a de Polignac number, because 642204453445 - 2⁹ = 642204452933 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64220445340 + ... + 64220445349.

It is an arithmetic number, because the mean of its divisors is an integer number (192661336035).

Almost surely, 2^642204453445 is an apocalyptic number.

It is an amenable number.

642204453445 is a deficient number, since it is larger than the sum of its proper divisors (128440890695).

642204453445 is a wasteful number, since it uses less digits than its factorization.

642204453445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128440890694.

The product of its (nonzero) digits is 1843200, while the sum is 43.

The spelling of 642204453445 in words is "six hundred forty-two billion, two hundred four million, four hundred fifty-three thousand, four hundred forty-five".