206454001645 has 16 divisors (see below), whose sum is σ = 256310483760. Its totient is φ = 159453758464.

The previous prime is 206454001639. The next prime is 206454001673. The reversal of 206454001645 is 546100454602.

206454001645 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 8 ways, for example, as 659308329 + 205794693316 = 25677^2 + 453646^2 .

It is a cyclic number.

It is not a de Polignac number, because 206454001645 - 2⁷ = 206454001517 is a prime.

It is a super-3 number, since 3×206454001645³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1755099 + ... + 1869031.

It is an arithmetic number, because the mean of its divisors is an integer number (16019405235).

Almost surely, 2^206454001645 is an apocalyptic number.

It is an amenable number.

206454001645 is a deficient number, since it is larger than the sum of its proper divisors (49856482115).

206454001645 is a wasteful number, since it uses less digits than its factorization.

206454001645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126464.

The product of its (nonzero) digits is 115200, while the sum is 37.

The spelling of 206454001645 in words is "two hundred six billion, four hundred fifty-four million, one thousand, six hundred forty-five".