642644626211 has 8 divisors (see below), whose sum is σ = 738179180640. Its totient is φ = 548042116608.

The previous prime is 642644626199. The next prime is 642644626229. The reversal of 642644626211 is 112626446246.

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

It is not a de Polignac number, because 642644626211 - 2⁶ = 642644626147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642644623211) 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, 233009726 + ... + 233012483.

It is an arithmetic number, because the mean of its divisors is an integer number (92272397580).

Almost surely, 2^642644626211 is an apocalyptic number.

642644626211 is a deficient number, since it is larger than the sum of its proper divisors (95534554429).

642644626211 is a wasteful number, since it uses less digits than its factorization.

642644626211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466022413.

The product of its digits is 663552, while the sum is 44.

The spelling of 642644626211 in words is "six hundred forty-two billion, six hundred forty-four million, six hundred twenty-six thousand, two hundred eleven".