216455577 has 16 divisors (see below), whose sum is σ = 329091840. Its totient is φ = 125367552.

The previous prime is 216455563. The next prime is 216455621. The reversal of 216455577 is 775554612.

It is a happy number.

It is not a de Polignac number, because 216455577 - 2¹⁴ = 216439193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216455777) 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, 162577 + ... + 163902.

It is an arithmetic number, because the mean of its divisors is an integer number (20568240).

Almost surely, 2^216455577 is an apocalyptic number.

It is an amenable number.

216455577 is a deficient number, since it is larger than the sum of its proper divisors (112636263).

216455577 is a wasteful number, since it uses less digits than its factorization.

216455577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326512.

The product of its digits is 294000, while the sum is 42.

The square root of 216455577 is about 14712.4293371285. The cubic root of 216455577 is about 600.4215343342.

The spelling of 216455577 in words is "two hundred sixteen million, four hundred fifty-five thousand, five hundred seventy-seven".