165440401321636 has 48 divisors (see below), whose sum is σ = 360305774236800. Its totient is φ = 64855039350528.

The previous prime is 165440401321619. The next prime is 165440401321691. The reversal of 165440401321636 is 636123104044561.

165440401321636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 5361677641 + ... + 5361708496.

It is an arithmetic number, because the mean of its divisors is an integer number (7506370296600).

Almost surely, 2^{165440401321636} is an apocalyptic number.

It is an amenable number.

165440401321636 is an abundant number, since it is smaller than the sum of its proper divisors (194865372915164).

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

165440401321636 is a wasteful number, since it uses less digits than its factorization.

165440401321636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10723386196 (or 10723386194 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 46.

The spelling of 165440401321636 in words is "one hundred sixty-five trillion, four hundred forty billion, four hundred one million, three hundred twenty-one thousand, six hundred thirty-six".