216690553529418 has 16 divisors (see below), whose sum is σ = 433492031371680. Its totient is φ = 72211697124336.

The previous prime is 216690553529407. The next prime is 216690553529473. The reversal of 216690553529418 is 814925355096612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4621820973 + ... + 4621867856.

It is an arithmetic number, because the mean of its divisors is an integer number (27093251960730).

Almost surely, 2^{216690553529418} is an apocalyptic number.

216690553529418 is an abundant number, since it is smaller than the sum of its proper divisors (216801477842262).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216690553529418 is a wasteful number, since it uses less digits than its factorization.

216690553529418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9243692741.

The product of its (nonzero) digits is 139968000, while the sum is 66.

The spelling of 216690553529418 in words is "two hundred sixteen trillion, six hundred ninety billion, five hundred fifty-three million, five hundred twenty-nine thousand, four hundred eighteen".