216155550 has 48 divisors (see below), whose sum is σ = 577306800. Its totient is φ = 53207040.

The previous prime is 216155549. The next prime is 216155557. The reversal of 216155550 is 55551612.

216155550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216155557) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53475 + ... + 57374.

It is an arithmetic number, because the mean of its divisors is an integer number (12027225).

Almost surely, 2^216155550 is an apocalyptic number.

216155550 is an abundant number, since it is smaller than the sum of its proper divisors (361151250).

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

216155550 is a wasteful number, since it uses less digits than its factorization.

216155550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110877 (or 110872 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 30.

The square root of 216155550 is about 14702.2294227780. The cubic root of 216155550 is about 600.1439932183.

The spelling of 216155550 in words is "two hundred sixteen million, one hundred fifty-five thousand, five hundred fifty".