642204055 has 4 divisors (see below), whose sum is σ = 770644872. Its totient is φ = 513763240.

The previous prime is 642204041. The next prime is 642204061. The reversal of 642204055 is 550402246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 550402246 = 2 ⋅275201123.

It is not a de Polignac number, because 642204055 - 2¹³ = 642195863 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 3 ways as a sum of consecutive naturals, for example, 64220401 + ... + 64220410.

It is an arithmetic number, because the mean of its divisors is an integer number (192661218).

Almost surely, 2^642204055 is an apocalyptic number.

642204055 is a deficient number, since it is larger than the sum of its proper divisors (128440817).

642204055 is a wasteful number, since it uses less digits than its factorization.

642204055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128440816.

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 642204055 is about 25341.7453029581. The cubic root of 642204055 is about 862.7620118349.

The spelling of 642204055 in words is "six hundred forty-two million, two hundred four thousand, fifty-five".