208451368640 has 56 divisors (see below), whose sum is σ = 499662187872. Its totient is φ = 82828339200.

The previous prime is 208451368613. The next prime is 208451368661. The reversal of 208451368640 is 46863154802.

It is a super-3 number, since 3×208451368640³ (a number of 35 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2108669 + ... + 2205308.

Almost surely, 2^208451368640 is an apocalyptic number.

208451368640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

208451368640 is an abundant number, since it is smaller than the sum of its proper divisors (291210819232).

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

208451368640 is a wasteful number, since it uses less digits than its factorization.

208451368640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4314145 (or 4314135 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 47.

The spelling of 208451368640 in words is "two hundred eight billion, four hundred fifty-one million, three hundred sixty-eight thousand, six hundred forty".