13660511220 has 48 divisors (see below), whose sum is σ = 42499369920. Its totient is φ = 3642802848.

The previous prime is 13660511107. The next prime is 13660511273. The reversal of 13660511220 is 2211506631.

13660511220 is a `hidden beast` number, since 1 + 36 + 605 + 1 + 1 + 2 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12648082 + ... + 12649161.

It is an arithmetic number, because the mean of its divisors is an integer number (885403540).

Almost surely, 2^13660511220 is an apocalyptic number.

13660511220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13660511220 is an abundant number, since it is smaller than the sum of its proper divisors (28838858700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13660511220 is a wasteful number, since it uses less digits than its factorization.

13660511220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25297261 (or 25297253 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The spelling of 13660511220 in words is "thirteen billion, six hundred sixty million, five hundred eleven thousand, two hundred twenty".