642041140247 has 4 divisors (see below), whose sum is σ = 691428920280. Its totient is φ = 592653360216.

The previous prime is 642041140243. The next prime is 642041140267. The reversal of 642041140247 is 742041140246.

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

It is a cyclic number.

It is not a de Polignac number, because 642041140247 - 2² = 642041140243 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642041140243) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 24693889997 + ... + 24693890022.

It is an arithmetic number, because the mean of its divisors is an integer number (172857230070).

Almost surely, 2^642041140247 is an apocalyptic number.

642041140247 is a deficient number, since it is larger than the sum of its proper divisors (49387780033).

642041140247 is a wasteful number, since it uses less digits than its factorization.

642041140247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49387780032.

The product of its (nonzero) digits is 43008, while the sum is 35.

Subtracting 642041140247 from its reverse (742041140246), we obtain a palindrome (99999999999).

The spelling of 642041140247 in words is "six hundred forty-two billion, forty-one million, one hundred forty thousand, two hundred forty-seven".