3661730915820 has 192 divisors, whose sum is σ = 10897721856000. Its totient is φ = 916054306560.

The previous prime is 3661730915807. The next prime is 3661730915849. The reversal of 3661730915820 is 285190371663.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 425827881 + ... + 425836479.

It is an arithmetic number, because the mean of its divisors is an integer number (56758968000).

Almost surely, 2^{3661730915820} is an apocalyptic number.

3661730915820 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3661730915820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5448860928000).

3661730915820 is an abundant number, since it is smaller than the sum of its proper divisors (7235990940180).

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

3661730915820 is a wasteful number, since it uses less digits than its factorization.

3661730915820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12228 (or 12226 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 51.

The spelling of 3661730915820 in words is "three trillion, six hundred sixty-one billion, seven hundred thirty million, nine hundred fifteen thousand, eight hundred twenty".