642175783454 has 4 divisors (see below), whose sum is σ = 963263675184. Its totient is φ = 321087891726.

The previous prime is 642175783429. The next prime is 642175783489. The reversal of 642175783454 is 454387571246.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 642175783454.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160543945862 + ... + 160543945865.

It is an arithmetic number, because the mean of its divisors is an integer number (240815918796).

Almost surely, 2^642175783454 is an apocalyptic number.

642175783454 is a deficient number, since it is larger than the sum of its proper divisors (321087891730).

642175783454 is a wasteful number, since it uses less digits than its factorization.

642175783454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321087891729.

The product of its digits is 22579200, while the sum is 56.

The spelling of 642175783454 in words is "six hundred forty-two billion, one hundred seventy-five million, seven hundred eighty-three thousand, four hundred fifty-four".