216640516 has 6 divisors (see below), whose sum is σ = 379120910. Its totient is φ = 108320256.

The previous prime is 216640483. The next prime is 216640517. The reversal of 216640516 is 615046612.

It can be written as a sum of positive squares in only one way, i.e., 119814916 + 96825600 = 10946^2 + 9840^2 .

It is a super-2 number, since 2×216640516² = 93866226345492512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216640517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27080061 + ... + 27080068.

Almost surely, 2^216640516 is an apocalyptic number.

It is an amenable number.

216640516 is a deficient number, since it is larger than the sum of its proper divisors (162480394).

216640516 is a wasteful number, since it uses less digits than its factorization.

216640516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54160133 (or 54160131 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 216640516 is about 14718.7131230961. The cubic root of 216640516 is about 600.5924851134.

It can be divided in two parts, 216640 and 516, that added together give a square (217156 = 466²).

The spelling of 216640516 in words is "two hundred sixteen million, six hundred forty thousand, five hundred sixteen".