216553466 has 4 divisors (see below), whose sum is σ = 324830202. Its totient is φ = 108276732.

The previous prime is 216553433. The next prime is 216553481. The reversal of 216553466 is 664355612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 198669025 + 17884441 = 14095^2 + 4229^2 .

It is a super-2 number, since 2×216553466² = 93790807273226312, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54138365 + ... + 54138368.

Almost surely, 2^216553466 is an apocalyptic number.

216553466 is a deficient number, since it is larger than the sum of its proper divisors (108276736).

216553466 is a wasteful number, since it uses less digits than its factorization.

216553466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108276735.

The product of its digits is 129600, while the sum is 38.

The square root of 216553466 is about 14715.7557060451. The cubic root of 216553466 is about 600.5120314339.

The spelling of 216553466 in words is "two hundred sixteen million, five hundred fifty-three thousand, four hundred sixty-six".