3661520654646 has 64 divisors (see below), whose sum is σ = 8498867120640. Its totient is φ = 1166288508000.

The previous prime is 3661520654569. The next prime is 3661520654647. The reversal of 3661520654646 is 6464560251663.

3661520654646 is a `hidden beast` number, since 3 + 6 + 6 + 1 + 52 + 0 + 6 + 546 + 46 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 3661520654592 and 3661520654601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3661520654647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 196980 + ... + 2713271.

It is an arithmetic number, because the mean of its divisors is an integer number (132794798760).

Almost surely, 2^{3661520654646} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3661520654646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4249433560320).

3661520654646 is an abundant number, since it is smaller than the sum of its proper divisors (4837346465994).

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

3661520654646 is a wasteful number, since it uses less digits than its factorization.

3661520654646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2911298 (or 2911292 counting only the distinct ones).

The product of its (nonzero) digits is 18662400, while the sum is 54.

The spelling of 3661520654646 in words is "three trillion, six hundred sixty-one billion, five hundred twenty million, six hundred fifty-four thousand, six hundred forty-six".