208618191408 has 40 divisors (see below), whose sum is σ = 587923995456. Its totient is φ = 63217633600.

The previous prime is 208618191367. The next prime is 208618191539. The reversal of 208618191408 is 804191816802.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 197554578 + ... + 197555633.

Almost surely, 2^208618191408 is an apocalyptic number.

It is an amenable number.

208618191408 is an abundant number, since it is smaller than the sum of its proper divisors (379305804048).

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

208618191408 is a wasteful number, since it uses less digits than its factorization.

208618191408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395110233 (or 395110227 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 48.

The spelling of 208618191408 in words is "two hundred eight billion, six hundred eighteen million, one hundred ninety-one thousand, four hundred eight".