3668988493521 has 20 divisors (see below), whose sum is σ = 5902437331252. Its totient is φ = 2257839072288.

The previous prime is 3668988493453. The next prime is 3668988493589. The reversal of 3668988493521 is 1253948898663.

It is a happy number.

3668988493521 is a `hidden beast` number, since 3 + 6 + 6 + 8 + 9 + 8 + 8 + 4 + 93 + 521 = 666.

It is an interprime number because it is at equal distance from previous prime (3668988493453) and next prime (3668988493589).

It can be written as a sum of positive squares in 2 ways, for example, as 231539004225 + 3437449489296 = 481185^2 + 1854036^2 .

It is not a de Polignac number, because 3668988493521 - 2¹¹ = 3668988491473 is a prime.

It is a super-2 number, since 2×3668988493521² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3668988493521.

It is not an unprimeable number, because it can be changed into a prime (3668988493721) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1742158726 + ... + 1742160831.

Almost surely, 2^{3668988493521} is an apocalyptic number.

It is an amenable number.

3668988493521 is a deficient number, since it is larger than the sum of its proper divisors (2233448837731).

3668988493521 is a wasteful number, since it uses less digits than its factorization.

3668988493521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3484319582 (or 3484319573 counting only the distinct ones).

The product of its digits is 537477120, while the sum is 72.

The spelling of 3668988493521 in words is "three trillion, six hundred sixty-eight billion, nine hundred eighty-eight million, four hundred ninety-three thousand, five hundred twenty-one".