206432621623 has 16 divisors (see below), whose sum is σ = 209830001472. Its totient is φ = 203049504000.

The previous prime is 206432621621. The next prime is 206432621639. The reversal of 206432621623 is 326126234602.

It is a cyclic number.

It is not a de Polignac number, because 206432621623 - 2¹ = 206432621621 is a prime.

It is a super-2 number, since 2×206432621623² (a number of 23 digits) contains 22 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 (206432621621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100550665 + ... + 100552717.

It is an arithmetic number, because the mean of its divisors is an integer number (13114375092).

Almost surely, 2^206432621623 is an apocalyptic number.

206432621623 is a deficient number, since it is larger than the sum of its proper divisors (3397379849).

206432621623 is a wasteful number, since it uses less digits than its factorization.

206432621623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4746.

The product of its (nonzero) digits is 124416, while the sum is 37.

The spelling of 206432621623 in words is "two hundred six billion, four hundred thirty-two million, six hundred twenty-one thousand, six hundred twenty-three".