866653645 has 16 divisors (see below), whose sum is σ = 1221800832. Its totient is φ = 581808960.

The previous prime is 866653637. The next prime is 866653649. The reversal of 866653645 is 546356668.

866653645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 866653645 - 2³ = 866653637 is a prime.

It is a super-3 number, since 3×866653645³ (a number of 28 digits) contains 333 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 (866653649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 605337 + ... + 606766.

It is an arithmetic number, because the mean of its divisors is an integer number (76362552).

Almost surely, 2^866653645 is an apocalyptic number.

It is an amenable number.

866653645 is a deficient number, since it is larger than the sum of its proper divisors (355147187).

866653645 is a wasteful number, since it uses less digits than its factorization.

866653645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212132.

The product of its digits is 3110400, while the sum is 49.

The square root of 866653645 is about 29438.9817249170. The cubic root of 866653645 is about 953.4147269278.

The spelling of 866653645 in words is "eight hundred sixty-six million, six hundred fifty-three thousand, six hundred forty-five".