206451645 has 16 divisors (see below), whose sum is σ = 330502272. Its totient is φ = 110047680.

The previous prime is 206451631. The next prime is 206451653. The reversal of 206451645 is 546154602.

It is not a de Polignac number, because 206451645 - 2¹⁴ = 206435261 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, 46680 + ... + 50910.

It is an arithmetic number, because the mean of its divisors is an integer number (20656392).

Almost surely, 2^206451645 is an apocalyptic number.

It is an amenable number.

206451645 is a deficient number, since it is larger than the sum of its proper divisors (124050627).

206451645 is a wasteful number, since it uses less digits than its factorization.

206451645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7492.

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 206451645 is about 14368.4252790624. The cubic root of 206451645 is about 591.0253595813.

The spelling of 206451645 in words is "two hundred six million, four hundred fifty-one thousand, six hundred forty-five".