216465039999 has 96 divisors (see below), whose sum is σ = 363087676224. Its totient is φ = 123088896000.

The previous prime is 216465039949. The next prime is 216465040079. The reversal of 216465039999 is 999930564612.

It is not a de Polignac number, because 216465039999 - 2⁸ = 216465039743 is a prime.

It is a super-2 number, since 2×216465039999² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216465039949) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 24044499 + ... + 24053499.

It is an arithmetic number, because the mean of its divisors is an integer number (3782163294).

Almost surely, 2^216465039999 is an apocalyptic number.

216465039999 is a deficient number, since it is larger than the sum of its proper divisors (146622636225).

216465039999 is a wasteful number, since it uses less digits than its factorization.

216465039999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9257 (or 9254 counting only the distinct ones).

The product of its (nonzero) digits is 28343520, while the sum is 63.

The spelling of 216465039999 in words is "two hundred sixteen billion, four hundred sixty-five million, thirty-nine thousand, nine hundred ninety-nine".