66502161 has 48 divisors (see below), whose sum is σ = 111533760. Its totient is φ = 38836800.

The previous prime is 66502159. The next prime is 66502193. The reversal of 66502161 is 16120566.

It is a happy number.

66502161 is a `hidden beast` number, since 6 + 650 + 2 + 1 + 6 + 1 = 666.

It is not a de Polignac number, because 66502161 - 2¹ = 66502159 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66502151) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 285301 + ... + 285533.

It is an arithmetic number, because the mean of its divisors is an integer number (2323620).

Almost surely, 2^66502161 is an apocalyptic number.

It is an amenable number.

66502161 is a deficient number, since it is larger than the sum of its proper divisors (45031599).

66502161 is a wasteful number, since it uses less digits than its factorization.

66502161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315 (or 278 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 66502161 is about 8154.8857134849. The cubic root of 66502161 is about 405.1463394348.

The spelling of 66502161 in words is "sixty-six million, five hundred two thousand, one hundred sixty-one".