13545721660 has 24 divisors (see below), whose sum is σ = 29682799776. Its totient is φ = 5182710720.

The previous prime is 13545721633. The next prime is 13545721727. The reversal of 13545721660 is 6612754531.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14723151 + ... + 14724070.

It is an arithmetic number, because the mean of its divisors is an integer number (1236783324).

Almost surely, 2^13545721660 is an apocalyptic number.

13545721660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13545721660 is an abundant number, since it is smaller than the sum of its proper divisors (16137078116).

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

13545721660 is a wasteful number, since it uses less digits than its factorization.

13545721660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29447253 (or 29447251 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 13545721660 in words is "thirteen billion, five hundred forty-five million, seven hundred twenty-one thousand, six hundred sixty".