216660741 has 32 divisors (see below), whose sum is σ = 324200448. Its totient is φ = 127578240.

The previous prime is 216660737. The next prime is 216660749. The reversal of 216660741 is 147066612.

It is not a de Polignac number, because 216660741 - 2² = 216660737 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216660749) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 252385 + ... + 253241.

It is an arithmetic number, because the mean of its divisors is an integer number (10131264).

Almost surely, 2^216660741 is an apocalyptic number.

It is an amenable number.

216660741 is a deficient number, since it is larger than the sum of its proper divisors (107539707).

216660741 is a wasteful number, since it uses less digits than its factorization.

216660741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 216660741 is about 14719.4001576151. The cubic root of 216660741 is about 600.6111744538.

The spelling of 216660741 in words is "two hundred sixteen million, six hundred sixty thousand, seven hundred forty-one".