13503351661 has 4 divisors (see below), whose sum is σ = 14214054400. Its totient is φ = 12792648924.

The previous prime is 13503351647. The next prime is 13503351677. The reversal of 13503351661 is 16615330531.

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: 16615330531 = 38651 ⋅429881.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13503351661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13503351611) 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 3 ways as a sum of consecutive naturals, for example, 355351341 + ... + 355351378.

It is an arithmetic number, because the mean of its divisors is an integer number (3553513600).

Almost surely, 2^13503351661 is an apocalyptic number.

It is an amenable number.

13503351661 is a deficient number, since it is larger than the sum of its proper divisors (710702739).

13503351661 is an equidigital number, since it uses as much as digits as its factorization.

13503351661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710702738.

The product of its (nonzero) digits is 24300, while the sum is 34.

The spelling of 13503351661 in words is "thirteen billion, five hundred three million, three hundred fifty-one thousand, six hundred sixty-one".