206566021623 has 32 divisors (see below), whose sum is σ = 297893256192. Its totient is φ = 126567014400.

The previous prime is 206566021621. The next prime is 206566021631. The reversal of 206566021623 is 326120665602.

206566021623 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 206566021623 - 2¹ = 206566021621 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206566021621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42404878 + ... + 42409748.

It is an arithmetic number, because the mean of its divisors is an integer number (9309164256).

Almost surely, 2^206566021623 is an apocalyptic number.

206566021623 is a deficient number, since it is larger than the sum of its proper divisors (91327234569).

206566021623 is a wasteful number, since it uses less digits than its factorization.

206566021623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9375.

The product of its (nonzero) digits is 155520, while the sum is 39.

The spelling of 206566021623 in words is "two hundred six billion, five hundred sixty-six million, twenty-one thousand, six hundred twenty-three".