216550061 has 24 divisors (see below), whose sum is σ = 275779224. Its totient is φ = 168497280.

The previous prime is 216550057. The next prime is 216550073. The reversal of 216550061 is 160055612.

216550061 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 31753225 + 184796836 = 5635^2 + 13594^2 .

It is not a de Polignac number, because 216550061 - 2² = 216550057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216550061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216550091) 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, 36071 + ... + 41643.

It is an arithmetic number, because the mean of its divisors is an integer number (11490801).

Almost surely, 2^216550061 is an apocalyptic number.

It is an amenable number.

216550061 is a deficient number, since it is larger than the sum of its proper divisors (59229163).

216550061 is a wasteful number, since it uses less digits than its factorization.

216550061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5661 (or 5654 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 216550061 is about 14715.6400132648. The cubic root of 216550061 is about 600.5088840138.

The spelling of 216550061 in words is "two hundred sixteen million, five hundred fifty thousand, sixty-one".