642042240245 has 32 divisors (see below), whose sum is σ = 930905606400. Its totient is φ = 415264651776.

The previous prime is 642042240239. The next prime is 642042240263. The reversal of 642042240245 is 542042240246.

It is not a de Polignac number, because 642042240245 - 2¹⁰ = 642042239221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1955744 + ... + 2260313.

It is an arithmetic number, because the mean of its divisors is an integer number (29090800200).

Almost surely, 2^642042240245 is an apocalyptic number.

It is an amenable number.

642042240245 is a deficient number, since it is larger than the sum of its proper divisors (288863366155).

642042240245 is a wasteful number, since it uses less digits than its factorization.

642042240245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4216317.

The product of its (nonzero) digits is 122880, while the sum is 35.

Subtracting from 642042240245 its reverse (542042240246), we obtain a palindrome (99999999999).

The spelling of 642042240245 in words is "six hundred forty-two billion, forty-two million, two hundred forty thousand, two hundred forty-five".