3663761521 has 4 divisors (see below), whose sum is σ = 4187156032. Its totient is φ = 3140367012.

The previous prime is 3663761501. The next prime is 3663761533. The reversal of 3663761521 is 1251673663.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1251673663 = 7529 ⋅166247.

It is a cyclic number.

It is not a de Polignac number, because 3663761521 - 2¹⁵ = 3663728753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3663761501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261697245 + ... + 261697258.

It is an arithmetic number, because the mean of its divisors is an integer number (1046789008).

Almost surely, 2^3663761521 is an apocalyptic number.

It is an amenable number.

3663761521 is a deficient number, since it is larger than the sum of its proper divisors (523394511).

3663761521 is an equidigital number, since it uses as much as digits as its factorization.

3663761521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523394510.

The product of its digits is 136080, while the sum is 40.

The square root of 3663761521 is about 60529.0138776438. The cubic root of 3663761521 is about 1541.6143077980.

The spelling of 3663761521 in words is "three billion, six hundred sixty-three million, seven hundred sixty-one thousand, five hundred twenty-one".