208163974840 has 16 divisors (see below), whose sum is σ = 468368943480. Its totient is φ = 83265589920.

The previous prime is 208163974793. The next prime is 208163974841. The reversal of 208163974840 is 48479361802.

208163974840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208163974841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2602049646 + ... + 2602049725.

Almost surely, 2^208163974840 is an apocalyptic number.

208163974840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

208163974840 is an abundant number, since it is smaller than the sum of its proper divisors (260204968640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

208163974840 is a wasteful number, since it uses less digits than its factorization.

208163974840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5204099382 (or 5204099378 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 52.

The spelling of 208163974840 in words is "two hundred eight billion, one hundred sixty-three million, nine hundred seventy-four thousand, eight hundred forty".