642005564071 has 8 divisors (see below), whose sum is σ = 666994096080. Its totient is φ = 617207059392.

The previous prime is 642005564059. The next prime is 642005564093. The reversal of 642005564071 is 170465500246.

It is a happy number.

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

It is not a de Polignac number, because 642005564071 - 2⁷ = 642005563943 is a prime.

It is a super-2 number, since 2×642005564071² (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 (642005564021) 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, 47499945 + ... + 47513458.

It is an arithmetic number, because the mean of its divisors is an integer number (83374262010).

Almost surely, 2^642005564071 is an apocalyptic number.

642005564071 is a deficient number, since it is larger than the sum of its proper divisors (24988532009).

642005564071 is a wasteful number, since it uses less digits than its factorization.

642005564071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95013665.

The product of its (nonzero) digits is 201600, while the sum is 40.

The spelling of 642005564071 in words is "six hundred forty-two billion, five million, five hundred sixty-four thousand, seventy-one".