208397418979 has 4 divisors (see below), whose sum is σ = 208398480840. Its totient is φ = 208396357120.

The previous prime is 208397418959. The next prime is 208397419001. The reversal of 208397418979 is 979814793802.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 208397418979 - 2⁵ = 208397418947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208397418959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141169 + ... + 660850.

It is an arithmetic number, because the mean of its divisors is an integer number (52099620210).

Almost surely, 2^208397418979 is an apocalyptic number.

208397418979 is a deficient number, since it is larger than the sum of its proper divisors (1061861).

208397418979 is an equidigital number, since it uses as much as digits as its factorization.

208397418979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061860.

The product of its (nonzero) digits is 54867456, while the sum is 67.

The spelling of 208397418979 in words is "two hundred eight billion, three hundred ninety-seven million, four hundred eighteen thousand, nine hundred seventy-nine".