216521665150 has 24 divisors (see below), whose sum is σ = 460263197520. Its totient is φ = 74235999360.

The previous prime is 216521665121. The next prime is 216521665153. The reversal of 216521665150 is 51566125612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216521665153) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 309316315 + ... + 309317014.

It is an arithmetic number, because the mean of its divisors is an integer number (19177633230).

Almost surely, 2^216521665150 is an apocalyptic number.

216521665150 is an abundant number, since it is smaller than the sum of its proper divisors (243741532370).

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

216521665150 is a wasteful number, since it uses less digits than its factorization.

216521665150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618633348 (or 618633343 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 40.

The spelling of 216521665150 in words is "two hundred sixteen billion, five hundred twenty-one million, six hundred sixty-five thousand, one hundred fifty".