216165306553 has 16 divisors (see below), whose sum is σ = 250839921024. Its totient is φ = 182441508480.

The previous prime is 216165306551. The next prime is 216165306589. The reversal of 216165306553 is 355603561612.

It is not a de Polignac number, because 216165306553 - 2¹ = 216165306551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216165306551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1019901 + ... + 1213477.

It is an arithmetic number, because the mean of its divisors is an integer number (15677495064).

Almost surely, 2^216165306553 is an apocalyptic number.

It is an amenable number.

216165306553 is a deficient number, since it is larger than the sum of its proper divisors (34674614471).

216165306553 is a wasteful number, since it uses less digits than its factorization.

216165306553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196032.

The product of its (nonzero) digits is 486000, while the sum is 43.

The spelling of 216165306553 in words is "two hundred sixteen billion, one hundred sixty-five million, three hundred six thousand, five hundred fifty-three".