216912503907 has 96 divisors (see below), whose sum is σ = 361084389120. Its totient is φ = 129015504000.

The previous prime is 216912503881. The next prime is 216912503947. The reversal of 216912503907 is 709305219612.

It is a happy number.

216912503907 is a `hidden beast` number, since 2 + 1 + 6 + 9 + 1 + 250 + 390 + 7 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-216912503907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216912503947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 88210444 + ... + 88212902.

It is an arithmetic number, because the mean of its divisors is an integer number (3761295720).

Almost surely, 2^216912503907 is an apocalyptic number.

216912503907 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

216912503907 is a deficient number, since it is larger than the sum of its proper divisors (144171885213).

216912503907 is a wasteful number, since it uses less digits than its factorization.

216912503907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3087 (or 3075 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The spelling of 216912503907 in words is "two hundred sixteen billion, nine hundred twelve million, five hundred three thousand, nine hundred seven".