66409161 has 96 divisors (see below), whose sum is σ = 122572800. Its totient is φ = 31570560.

The previous prime is 66409153. The next prime is 66409163. The reversal of 66409161 is 16190466.

It is not a de Polignac number, because 66409161 - 2³ = 66409153 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66409163) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1125550 + ... + 1125608.

It is an arithmetic number, because the mean of its divisors is an integer number (1276800).

Almost surely, 2^66409161 is an apocalyptic number.

It is an amenable number.

66409161 is a deficient number, since it is larger than the sum of its proper divisors (56163639).

66409161 is a wasteful number, since it uses less digits than its factorization.

66409161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 66409161 is about 8149.1816153526. The cubic root of 66409161 is about 404.9573922559.

The spelling of 66409161 in words is "sixty-six million, four hundred nine thousand, one hundred sixty-one".