216287207409 has 36 divisors (see below), whose sum is σ = 363255986736. Its totient is φ = 114085546848.

The previous prime is 216287207401. The next prime is 216287207441. The reversal of 216287207409 is 904702782612.

It is not a de Polignac number, because 216287207409 - 2³ = 216287207401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216287207401) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4328239 + ... + 4377924.

It is an arithmetic number, because the mean of its divisors is an integer number (10090444076).

Almost surely, 2^216287207409 is an apocalyptic number.

It is an amenable number.

216287207409 is a deficient number, since it is larger than the sum of its proper divisors (146968779327).

216287207409 is a wasteful number, since it uses less digits than its factorization.

216287207409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8706206 (or 8706186 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 48.

The spelling of 216287207409 in words is "two hundred sixteen billion, two hundred eighty-seven million, two hundred seven thousand, four hundred nine".