208972643518 has 8 divisors (see below), whose sum is σ = 313461701640. Its totient is φ = 104485409640.

The previous prime is 208972643491. The next prime is 208972643521. The reversal of 208972643518 is 815346279802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×208972643518² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120213 + ... + 657568.

It is an arithmetic number, because the mean of its divisors is an integer number (39182712705).

It is a 2-persistent number, because it is pandigital, and so is 2⋅208972643518 = 417945287036, but 3⋅208972643518 = 626917930554 is not.

Almost surely, 2^208972643518 is an apocalyptic number.

208972643518 is a deficient number, since it is larger than the sum of its proper divisors (104489058122).

208972643518 is a wasteful number, since it uses less digits than its factorization.

208972643518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912122.

The product of its (nonzero) digits is 5806080, while the sum is 55.

The spelling of 208972643518 in words is "two hundred eight billion, nine hundred seventy-two million, six hundred forty-three thousand, five hundred eighteen".