216500649 has 16 divisors (see below), whose sum is σ = 304207680. Its totient is φ = 136581120.

The previous prime is 216500639. The next prime is 216500681. The reversal of 216500649 is 946005612.

It is not a de Polignac number, because 216500649 - 2⁵ = 216500617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216500639) 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, 67809 + ... + 70929.

It is an arithmetic number, because the mean of its divisors is an integer number (19012980).

Almost surely, 2^216500649 is an apocalyptic number.

It is an amenable number.

216500649 is a deficient number, since it is larger than the sum of its proper divisors (87707031).

216500649 is a wasteful number, since it uses less digits than its factorization.

216500649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4360.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 216500649 is about 14713.9610234634. The cubic root of 216500649 is about 600.4632061969.

The spelling of 216500649 in words is "two hundred sixteen million, five hundred thousand, six hundred forty-nine".