206615566157 has 16 divisors (see below), whose sum is σ = 277413908352. Its totient is φ = 148614592320.

The previous prime is 206615566141. The next prime is 206615566211. The reversal of 206615566157 is 751665516602.

It is a cyclic number.

It is not a de Polignac number, because 206615566157 - 2⁴ = 206615566141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206615566117) 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, 103203578 + ... + 103205579.

It is an arithmetic number, because the mean of its divisors is an integer number (17338369272).

Almost surely, 2^206615566157 is an apocalyptic number.

It is an amenable number.

206615566157 is a deficient number, since it is larger than the sum of its proper divisors (70798342195).

206615566157 is a wasteful number, since it uses less digits than its factorization.

206615566157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206409188.

The product of its (nonzero) digits is 2268000, while the sum is 50.

It can be divided in two parts, 2066155 and 66157, that added together give a palindrome (2132312).

The spelling of 206615566157 in words is "two hundred six billion, six hundred fifteen million, five hundred sixty-six thousand, one hundred fifty-seven".