216516501 has 12 divisors (see below), whose sum is σ = 318647628. Its totient is φ = 141620544.

The previous prime is 216516491. The next prime is 216516529. The reversal of 216516501 is 105615612.

It is a happy number.

216516501 is a `hidden beast` number, since 2 + 1 + 6 + 5 + 1 + 650 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 68310225 + 148206276 = 8265^2 + 12174^2 .

It is not a de Polignac number, because 216516501 - 2⁹ = 216515989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216516541) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 226480 + ... + 227433.

It is an arithmetic number, because the mean of its divisors is an integer number (26553969).

Almost surely, 2^216516501 is an apocalyptic number.

It is an amenable number.

216516501 is a deficient number, since it is larger than the sum of its proper divisors (102131127).

216516501 is a wasteful number, since it uses less digits than its factorization.

216516501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453972 (or 453969 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 216516501 is about 14714.4996856842. The cubic root of 216516501 is about 600.4778609804.

The spelling of 216516501 in words is "two hundred sixteen million, five hundred sixteen thousand, five hundred one".