206378653 has 8 divisors (see below), whose sum is σ = 224455896. Its totient is φ = 188616000.

The previous prime is 206378647. The next prime is 206378671. The reversal of 206378653 is 356873602.

206378653 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 105637284 + 100741369 = 10278^2 + 10037^2 .

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 206378653 - 2⁵ = 206378621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206378603) 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, 77278 + ... + 79903.

It is an arithmetic number, because the mean of its divisors is an integer number (28056987).

Almost surely, 2^206378653 is an apocalyptic number.

It is an amenable number.

206378653 is a deficient number, since it is larger than the sum of its proper divisors (18077243).

206378653 is a wasteful number, since it uses less digits than its factorization.

206378653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157295.

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 206378653 is about 14365.8850406092. The cubic root of 206378653 is about 590.9556980581.

The spelling of 206378653 in words is "two hundred six million, three hundred seventy-eight thousand, six hundred fifty-three".