66535161 has 32 divisors (see below), whose sum is σ = 117116928. Its totient is φ = 32528640.

The previous prime is 66535153. The next prime is 66535177. The reversal of 66535161 is 16153566.

It is not a de Polignac number, because 66535161 - 2³ = 66535153 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (66535111) 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, 4545 + ... + 12398.

It is an arithmetic number, because the mean of its divisors is an integer number (3659904).

Almost surely, 2^66535161 is an apocalyptic number.

It is an amenable number.

66535161 is a deficient number, since it is larger than the sum of its proper divisors (50581767).

66535161 is a wasteful number, since it uses less digits than its factorization.

66535161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16981.

The product of its digits is 16200, while the sum is 33.

The square root of 66535161 is about 8156.9087894864. The cubic root of 66535161 is about 405.2133428631.

The spelling of 66535161 in words is "sixty-six million, five hundred thirty-five thousand, one hundred sixty-one".