13660506557 has 4 divisors (see below), whose sum is σ = 13978192800. Its totient is φ = 13342820316.

The previous prime is 13660506533. The next prime is 13660506623. The reversal of 13660506557 is 75560506631.

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: 75560506631 = 3931 ⋅19221701.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13660506557 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 (13660506527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158843057 + ... + 158843142.

It is an arithmetic number, because the mean of its divisors is an integer number (3494548200).

Almost surely, 2^13660506557 is an apocalyptic number.

It is an amenable number.

13660506557 is a deficient number, since it is larger than the sum of its proper divisors (317686243).

13660506557 is an equidigital number, since it uses as much as digits as its factorization.

13660506557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317686242.

The product of its (nonzero) digits is 567000, while the sum is 44.

The spelling of 13660506557 in words is "thirteen billion, six hundred sixty million, five hundred six thousand, five hundred fifty-seven".