13655557 has 4 divisors (see below), whose sum is σ = 13662976. Its totient is φ = 13648140.

The previous prime is 13655533. The next prime is 13655561. The reversal of 13655557 is 75555631.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 13655557 - 2⁷ = 13655429 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 (13655507) 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, 1378 + ... + 5404.

It is an arithmetic number, because the mean of its divisors is an integer number (3415744).

Almost surely, 2^13655557 is an apocalyptic number.

It is an amenable number.

13655557 is a deficient number, since it is larger than the sum of its proper divisors (7419).

13655557 is an equidigital number, since it uses as much as digits as its factorization.

13655557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7418.

The product of its digits is 78750, while the sum is 37.

The square root of 13655557 is about 3695.3426092854. The cubic root of 13655557 is about 239.0212279015.

The spelling of 13655557 in words is "thirteen million, six hundred fifty-five thousand, five hundred fifty-seven".