206816986478 has 4 divisors (see below), whose sum is σ = 310225479720. Its totient is φ = 103408493238.

The previous prime is 206816986459. The next prime is 206816986553. The reversal of 206816986478 is 874689618602.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51704246618 + ... + 51704246621.

It is an arithmetic number, because the mean of its divisors is an integer number (77556369930).

Almost surely, 2^206816986478 is an apocalyptic number.

206816986478 is a deficient number, since it is larger than the sum of its proper divisors (103408493242).

206816986478 is a wasteful number, since it uses less digits than its factorization.

206816986478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103408493241.

The product of its (nonzero) digits is 55738368, while the sum is 65.

The spelling of 206816986478 in words is "two hundred six billion, eight hundred sixteen million, nine hundred eighty-six thousand, four hundred seventy-eight".