216747553 has 4 divisors (see below), whose sum is σ = 236451888. Its totient is φ = 197043220.

The previous prime is 216747547. The next prime is 216747589. The reversal of 216747553 is 355747612.

216747553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 216747553 - 2⁵ = 216747521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216747523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9852151 + ... + 9852172.

It is an arithmetic number, because the mean of its divisors is an integer number (59112972).

Almost surely, 2^216747553 is an apocalyptic number.

It is an amenable number.

216747553 is a deficient number, since it is larger than the sum of its proper divisors (19704335).

216747553 is a wasteful number, since it uses less digits than its factorization.

216747553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19704334.

The product of its digits is 176400, while the sum is 40.

The square root of 216747553 is about 14722.3487596239. The cubic root of 216747553 is about 600.6913817166.

The spelling of 216747553 in words is "two hundred sixteen million, seven hundred forty-seven thousand, five hundred fifty-three".