206478075248639 has 4 divisors (see below), whose sum is σ = 206478175153920. Its totient is φ = 206477975343360.

The previous prime is 206478075248633. The next prime is 206478075248659. The reversal of 206478075248639 is 936842570874602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 206478075248639 - 2²⁴ = 206478058471423 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 (206478075248633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46785602 + ... + 51008319.

It is an arithmetic number, because the mean of its divisors is an integer number (51619543788480).

Almost surely, 2^{206478075248639} is an apocalyptic number.

206478075248639 is a deficient number, since it is larger than the sum of its proper divisors (99905281).

206478075248639 is an equidigital number, since it uses as much as digits as its factorization.

206478075248639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99905280.

The product of its (nonzero) digits is 975421440, while the sum is 71.

The spelling of 206478075248639 in words is "two hundred six trillion, four hundred seventy-eight billion, seventy-five million, two hundred forty-eight thousand, six hundred thirty-nine".