206506656579 has 16 divisors (see below), whose sum is σ = 291626887680. Its totient is φ = 129533658240.

The previous prime is 206506656547. The next prime is 206506656617. The reversal of 206506656579 is 975656605602.

It is not a de Polignac number, because 206506656579 - 2⁵ = 206506656547 is a prime.

It is a super-2 number, since 2×206506656579² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (206506656179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 440727 + ... + 779264.

It is an arithmetic number, because the mean of its divisors is an integer number (18226680480).

Almost surely, 2^206506656579 is an apocalyptic number.

206506656579 is a deficient number, since it is larger than the sum of its proper divisors (85120231101).

206506656579 is a wasteful number, since it uses less digits than its factorization.

206506656579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1223330.

The product of its (nonzero) digits is 20412000, while the sum is 57.

The spelling of 206506656579 in words is "two hundred six billion, five hundred six million, six hundred fifty-six thousand, five hundred seventy-nine".