13655569920 has 80 divisors (see below), whose sum is σ = 43655174640. Its totient is φ = 3641483264.

The previous prime is 13655569919. The next prime is 13655569931. The reversal of 13655569920 is 2996555631.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 881355 + ... + 896714.

It is an arithmetic number, because the mean of its divisors is an integer number (545689683).

Almost surely, 2^13655569920 is an apocalyptic number.

13655569920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13655569920 is an abundant number, since it is smaller than the sum of its proper divisors (29999604720).

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

13655569920 is an equidigital number, since it uses as much as digits as its factorization.

13655569920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1778095 (or 1778079 counting only the distinct ones).

The product of its (nonzero) digits is 2187000, while the sum is 51.

The spelling of 13655569920 in words is "thirteen billion, six hundred fifty-five million, five hundred sixty-nine thousand, nine hundred twenty".