3521639721600 has 3840 divisors, whose sum is σ = 17869043808000. Its totient is φ = 673040793600.

The previous prime is 3521639721583. The next prime is 3521639721623. The reversal of 3521639721600 is 61279361253.

3521639721600 is a `hidden beast` number, since 3 + 5 + 2 + 1 + 6 + 39 + 7 + 2 + 1 + 600 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

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 479 ways as a sum of consecutive naturals, for example, 12713500662 + ... + 12713500938.

It is an arithmetic number, because the mean of its divisors is an integer number (4653396825).

Almost surely, 2^{3521639721600} is an apocalyptic number.

3521639721600 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 3521639721600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8934521904000).

3521639721600 is an abundant number, since it is smaller than the sum of its proper divisors (14347404086400).

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

3521639721600 is a wasteful number, since it uses less digits than its factorization.

3521639721600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358 (or 318 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The spelling of 3521639721600 in words is "three trillion, five hundred twenty-one billion, six hundred thirty-nine million, seven hundred twenty-one thousand, six hundred".