642065707567 has 4 divisors (see below), whose sum is σ = 669981607920. Its totient is φ = 614149807216.

The previous prime is 642065707559. The next prime is 642065707573. The reversal of 642065707567 is 765707560246.

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 642065707567 - 2³ = 642065707559 is a prime.

It is a super-2 number, since 2×642065707567² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642065707597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13957950142 + ... + 13957950187.

It is an arithmetic number, because the mean of its divisors is an integer number (167495401980).

Almost surely, 2^642065707567 is an apocalyptic number.

642065707567 is a deficient number, since it is larger than the sum of its proper divisors (27915900353).

642065707567 is a wasteful number, since it uses less digits than its factorization.

642065707567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27915900352.

The product of its (nonzero) digits is 14817600, while the sum is 55.

The spelling of 642065707567 in words is "six hundred forty-two billion, sixty-five million, seven hundred seven thousand, five hundred sixty-seven".