216266499 has 12 divisors (see below), whose sum is σ = 312514696. Its totient is φ = 144117792.

The previous prime is 216266489. The next prime is 216266527. The reversal of 216266499 is 994662612.

It is not a de Polignac number, because 216266499 - 2⁴ = 216266483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216266489) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33552 + ... + 39474.

Almost surely, 2^216266499 is an apocalyptic number.

216266499 is a deficient number, since it is larger than the sum of its proper divisors (96248197).

216266499 is a wasteful number, since it uses less digits than its factorization.

216266499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9986 (or 9983 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 216266499 is about 14706.0021419827. The cubic root of 216266499 is about 600.2466569200.

The spelling of 216266499 in words is "two hundred sixteen million, two hundred sixty-six thousand, four hundred ninety-nine".