642612020042 has 32 divisors (see below), whose sum is σ = 980926982784. Its totient is φ = 315687168000.

The previous prime is 642612019957. The next prime is 642612020051. The reversal of 642612020042 is 240020216246.

It is a junction number, because it is equal to n+sod(n) for n = 642612019987 and 642612020014.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53045378 + ... + 53057490.

It is an arithmetic number, because the mean of its divisors is an integer number (30653968212).

Almost surely, 2^642612020042 is an apocalyptic number.

642612020042 is a deficient number, since it is larger than the sum of its proper divisors (338314962742).

642612020042 is a wasteful number, since it uses less digits than its factorization.

642612020042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14174.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 642612020042 its reverse (240020216246), we get a palindrome (882632236288).

The spelling of 642612020042 in words is "six hundred forty-two billion, six hundred twelve million, twenty thousand, forty-two".