216601515 has 48 divisors (see below), whose sum is σ = 415291968. Its totient is φ = 103742208.

The previous prime is 216601507. The next prime is 216601537. The reversal of 216601515 is 515106612.

It is a happy number.

216601515 is a `hidden beast` number, since 2 + 1 + 6 + 601 + 51 + 5 = 666.

It is not a de Polignac number, because 216601515 - 2³ = 216601507 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16642 + ... + 26648.

It is an arithmetic number, because the mean of its divisors is an integer number (8651916).

Almost surely, 2^216601515 is an apocalyptic number.

216601515 is a deficient number, since it is larger than the sum of its proper divisors (198690453).

216601515 is a wasteful number, since it uses less digits than its factorization.

216601515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10068 (or 10065 counting only the distinct ones).

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

The square root of 216601515 is about 14717.3881854084. The cubic root of 216601515 is about 600.5564421274.

The spelling of 216601515 in words is "two hundred sixteen million, six hundred one thousand, five hundred fifteen".