13660551 has 12 divisors (see below), whose sum is σ = 20590128. Its totient is φ = 8710944.

The previous prime is 13660547. The next prime is 13660561. The reversal of 13660551 is 15506631.

It is a happy number.

13660551 is a `hidden beast` number, since 1 + 3 + 6 + 605 + 51 = 666.

It is not a de Polignac number, because 13660551 - 2² = 13660547 is a prime.

It is a super-2 number, since 2×13660551² = 373221307247202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13660531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32790 + ... + 33203.

It is an arithmetic number, because the mean of its divisors is an integer number (1715844).

Almost surely, 2^13660551 is an apocalyptic number.

13660551 is a deficient number, since it is larger than the sum of its proper divisors (6929577).

13660551 is a wasteful number, since it uses less digits than its factorization.

13660551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66022 (or 66019 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 13660551 is about 3696.0182629419. The cubic root of 13660551 is about 239.0503619878.

The spelling of 13660551 in words is "thirteen million, six hundred sixty thousand, five hundred fifty-one".