642746242478 has 4 divisors (see below), whose sum is σ = 964119363720. Its totient is φ = 321373121238.

The previous prime is 642746242471. The next prime is 642746242499. The reversal of 642746242478 is 874242647246.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642746242471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160686560618 + ... + 160686560621.

It is an arithmetic number, because the mean of its divisors is an integer number (241029840930).

Almost surely, 2^642746242478 is an apocalyptic number.

642746242478 is a deficient number, since it is larger than the sum of its proper divisors (321373121242).

642746242478 is a wasteful number, since it uses less digits than its factorization.

642746242478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321373121241.

The product of its digits is 28901376, while the sum is 56.

The spelling of 642746242478 in words is "six hundred forty-two billion, seven hundred forty-six million, two hundred forty-two thousand, four hundred seventy-eight".