206835661 has 8 divisors (see below), whose sum is σ = 212839064. Its totient is φ = 200854080.

The previous prime is 206835659. The next prime is 206835737. The reversal of 206835661 is 166538602.

206835661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 84290761 + 122544900 = 9181^2 + 11070^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 206835661 - 2¹ = 206835659 is a prime.

It is a super-2 number, since 2×206835661² = 85561981322613842, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 206835661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206835631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14851 + ... + 25183.

It is an arithmetic number, because the mean of its divisors is an integer number (26604883).

Almost surely, 2^206835661 is an apocalyptic number.

It is an amenable number.

206835661 is a deficient number, since it is larger than the sum of its proper divisors (6003403).

206835661 is a wasteful number, since it uses less digits than its factorization.

206835661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10911.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 206835661 is about 14381.7822609022. The cubic root of 206835661 is about 591.3915835409.

The spelling of 206835661 in words is "two hundred six million, eight hundred thirty-five thousand, six hundred sixty-one".