215641616 has 10 divisors (see below), whose sum is σ = 417805662. Its totient is φ = 107820800.

The previous prime is 215641609. The next prime is 215641619. The reversal of 215641616 is 616146512.

It can be written as a sum of positive squares in only one way, i.e., 172134400 + 43507216 = 13120^2 + 6596^2 .

It is not an unprimeable number, because it can be changed into a prime (215641619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6738785 + ... + 6738816.

Almost surely, 2^215641616 is an apocalyptic number.

It is an amenable number.

215641616 is a deficient number, since it is larger than the sum of its proper divisors (202164046).

215641616 is a wasteful number, since it uses less digits than its factorization.

215641616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13477609 (or 13477603 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 215641616 is about 14684.7409238297. The cubic root of 215641616 is about 599.6679792672.

The spelling of 215641616 in words is "two hundred fifteen million, six hundred forty-one thousand, six hundred sixteen".