642042240247 has 8 divisors (see below), whose sum is σ = 652584311792. Its totient is φ = 631500710400.

The previous prime is 642042240239. The next prime is 642042240263. The reversal of 642042240247 is 742042240246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 642042240247 - 2³ = 642042240239 is a prime.

It is a super-2 number, since 2×642042240247² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642042240277) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2757628 + ... + 2981374.

It is an arithmetic number, because the mean of its divisors is an integer number (81573038974).

Almost surely, 2^642042240247 is an apocalyptic number.

642042240247 is a deficient number, since it is larger than the sum of its proper divisors (10542071545).

642042240247 is a wasteful number, since it uses less digits than its factorization.

642042240247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270849.

The product of its (nonzero) digits is 172032, while the sum is 37.

Subtracting 642042240247 from its reverse (742042240246), we obtain a palindrome (99999999999).

The spelling of 642042240247 in words is "six hundred forty-two billion, forty-two million, two hundred forty thousand, two hundred forty-seven".