208891440593904 has 80 divisors (see below), whose sum is σ = 553107750624000. Its totient is φ = 67897625123328.

The previous prime is 208891440593879. The next prime is 208891440593911. The reversal of 208891440593904 is 409395044198802.

It is a super-2 number, since 2×208891440593904² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83243709 + ... + 85716380.

It is an arithmetic number, because the mean of its divisors is an integer number (6913846882800).

Almost surely, 2^{208891440593904} is an apocalyptic number.

208891440593904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

208891440593904 is an abundant number, since it is smaller than the sum of its proper divisors (344216310030096).

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

208891440593904 is a wasteful number, since it uses less digits than its factorization.

208891440593904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168960742 (or 168960736 counting only the distinct ones).

The product of its (nonzero) digits is 89579520, while the sum is 66.

The spelling of 208891440593904 in words is "two hundred eight trillion, eight hundred ninety-one billion, four hundred forty million, five hundred ninety-three thousand, nine hundred four".