216057651 has 4 divisors (see below), whose sum is σ = 288076872. Its totient is φ = 144038432.

The previous prime is 216057643. The next prime is 216057679. The reversal of 216057651 is 156750612.

216057651 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.

It is a cyclic number.

It is not a de Polignac number, because 216057651 - 2³ = 216057643 is a prime.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (216057691) 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, 36009606 + ... + 36009611.

It is an arithmetic number, because the mean of its divisors is an integer number (72019218).

Almost surely, 2^216057651 is an apocalyptic number.

216057651 is a deficient number, since it is larger than the sum of its proper divisors (72019221).

216057651 is an equidigital number, since it uses as much as digits as its factorization.

216057651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72019220.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 216057651 is about 14698.8996526951. The cubic root of 216057651 is about 600.0533758071.

The spelling of 216057651 in words is "two hundred sixteen million, fifty-seven thousand, six hundred fifty-one".