206155004565 has 16 divisors (see below), whose sum is σ = 329943339648. Its totient is φ = 109917558336.

The previous prime is 206155004513. The next prime is 206155004591. The reversal of 206155004565 is 565400551602.

It is a happy number.

It is not a de Polignac number, because 206155004565 - 2⁷ = 206155004437 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1932414 + ... + 2036303.

It is an arithmetic number, because the mean of its divisors is an integer number (20621458728).

Almost surely, 2^206155004565 is an apocalyptic number.

It is an amenable number.

206155004565 is a deficient number, since it is larger than the sum of its proper divisors (123788335083).

206155004565 is a wasteful number, since it uses less digits than its factorization.

206155004565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3972188.

The product of its (nonzero) digits is 180000, while the sum is 39.

The spelling of 206155004565 in words is "two hundred six billion, one hundred fifty-five million, four thousand, five hundred sixty-five".