206538878345 has 16 divisors (see below), whose sum is σ = 266873771520. Its totient is φ = 152875832064.

The previous prime is 206538878341. The next prime is 206538878363. The reversal of 206538878345 is 543878835602.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 206538878345 - 2² = 206538878341 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is not an unprimeable number, because it can be changed into a prime (206538878341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20587097 + ... + 20597126.

It is an arithmetic number, because the mean of its divisors is an integer number (16679610720).

Almost surely, 2^206538878345 is an apocalyptic number.

It is an amenable number.

206538878345 is a deficient number, since it is larger than the sum of its proper divisors (60334893175).

206538878345 is a wasteful number, since it uses less digits than its factorization.

206538878345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41184304.

The product of its (nonzero) digits is 38707200, while the sum is 59.

The spelling of 206538878345 in words is "two hundred six billion, five hundred thirty-eight million, eight hundred seventy-eight thousand, three hundred forty-five".