642556219 has 8 divisors (see below), whose sum is σ = 666887760. Its totient is φ = 618369696.

The previous prime is 642556151. The next prime is 642556241. The reversal of 642556219 is 912655246.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642556219 is a prime.

It is a super-2 number, since 2×642556219² = 825756989151151922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642556289) 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, 27184 + ... + 44989.

It is an arithmetic number, because the mean of its divisors is an integer number (83360970).

Almost surely, 2^642556219 is an apocalyptic number.

642556219 is a deficient number, since it is larger than the sum of its proper divisors (24331541).

642556219 is a wasteful number, since it uses less digits than its factorization.

642556219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72509.

The product of its digits is 129600, while the sum is 40.

The square root of 642556219 is about 25348.6926487344. The cubic root of 642556219 is about 862.9196866415.

The spelling of 642556219 in words is "six hundred forty-two million, five hundred fifty-six thousand, two hundred nineteen".