3668817781820 has 12 divisors (see below), whose sum is σ = 7704517341864. Its totient is φ = 1467527112720.

The previous prime is 3668817781819. The next prime is 3668817781841. The reversal of 3668817781820 is 281877188663.

It is a super-3 number, since 3×3668817781820³ (a number of 39 digits) contains 333 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, 91720444526 + ... + 91720444565.

It is an arithmetic number, because the mean of its divisors is an integer number (642043111822).

Almost surely, 2^{3668817781820} is an apocalyptic number.

It is an amenable number.

3668817781820 is an abundant number, since it is smaller than the sum of its proper divisors (4035699560044).

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

3668817781820 is a wasteful number, since it uses less digits than its factorization.

3668817781820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183440889100 (or 183440889098 counting only the distinct ones).

The product of its (nonzero) digits is 43352064, while the sum is 65.

The spelling of 3668817781820 in words is "three trillion, six hundred sixty-eight billion, eight hundred seventeen million, seven hundred eighty-one thousand, eight hundred twenty".