65666720622 has 8 divisors (see below), whose sum is σ = 131333441256. Its totient is φ = 21888906872.

The previous prime is 65666720617. The next prime is 65666720659. The reversal of 65666720622 is 22602766656.

65666720622 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

65666720622 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5472226713 + ... + 5472226724.

It is an arithmetic number, because the mean of its divisors is an integer number (16416680157).

Almost surely, 2^65666720622 is an apocalyptic number.

65666720622 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65666720622 is a wasteful number, since it uses less digits than its factorization.

65666720622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10944453442.

The product of its (nonzero) digits is 2177280, while the sum is 48.

The spelling of 65666720622 in words is "sixty-five billion, six hundred sixty-six million, seven hundred twenty thousand, six hundred twenty-two".