13721310166603 has 32 divisors (see below), whose sum is σ = 15249814899200. Its totient is φ = 12263754295296.

The previous prime is 13721310166589. The next prime is 13721310166657. The reversal of 13721310166603 is 30666101312731.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 13721310166603 - 2³⁷ = 13583871213131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13721310167603) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 236020243 + ... + 236078371.

It is an arithmetic number, because the mean of its divisors is an integer number (476556715600).

Almost surely, 2^{13721310166603} is an apocalyptic number.

13721310166603 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

13721310166603 is a deficient number, since it is larger than the sum of its proper divisors (1528504732597).

13721310166603 is a wasteful number, since it uses less digits than its factorization.

13721310166603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60551.

The product of its (nonzero) digits is 81648, while the sum is 40.

The spelling of 13721310166603 in words is "thirteen trillion, seven hundred twenty-one billion, three hundred ten million, one hundred sixty-six thousand, six hundred three".