642005564045 has 8 divisors (see below), whose sum is σ = 770572848024. Its totient is φ = 513493670464.

The previous prime is 642005564041. The next prime is 642005564059. The reversal of 642005564045 is 540465500246.

It can be written as a sum of positive squares in 4 ways, for example, as 79316836 + 641926247209 = 8906^2 + 801203^2 .

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 642005564045 - 2² = 642005564041 is a prime.

It is a super-2 number, since 2×642005564045² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642005563993 and 642005564011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642005564041) 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, 13822094 + ... + 13868463.

It is an arithmetic number, because the mean of its divisors is an integer number (96321606003).

Almost surely, 2^642005564045 is an apocalyptic number.

It is an amenable number.

642005564045 is a deficient number, since it is larger than the sum of its proper divisors (128567283979).

642005564045 is a wasteful number, since it uses less digits than its factorization.

642005564045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27695199.

The product of its (nonzero) digits is 576000, while the sum is 41.

The spelling of 642005564045 in words is "six hundred forty-two billion, five million, five hundred sixty-four thousand, forty-five".