642331774774 has 4 divisors (see below), whose sum is σ = 963497662164. Its totient is φ = 321165887386.

The previous prime is 642331774771. The next prime is 642331774807. The reversal of 642331774774 is 477477133246.

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 (642331774771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160582943692 + ... + 160582943695.

It is an arithmetic number, because the mean of its divisors is an integer number (240874415541).

Almost surely, 2^642331774774 is an apocalyptic number.

642331774774 is a deficient number, since it is larger than the sum of its proper divisors (321165887390).

642331774774 is a wasteful number, since it uses less digits than its factorization.

642331774774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321165887389.

The product of its digits is 16595712, while the sum is 55.

The spelling of 642331774774 in words is "six hundred forty-two billion, three hundred thirty-one million, seven hundred seventy-four thousand, seven hundred seventy-four".