216406451506 has 48 divisors (see below), whose sum is σ = 384960485952. Its totient is φ = 90948765600.

The previous prime is 216406451491. The next prime is 216406451531. The reversal of 216406451506 is 605154604612.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1924035 + ... + 2033401.

It is an arithmetic number, because the mean of its divisors is an integer number (8020010124).

Almost surely, 2^216406451506 is an apocalyptic number.

216406451506 is a deficient number, since it is larger than the sum of its proper divisors (168554034446).

216406451506 is a wasteful number, since it uses less digits than its factorization.

216406451506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109775 (or 109768 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 216406451506 in words is "two hundred sixteen billion, four hundred six million, four hundred fifty-one thousand, five hundred six".