66501161 has 8 divisors (see below), whose sum is σ = 70484904. Its totient is φ = 62525440.

The previous prime is 66501151. The next prime is 66501187. The reversal of 66501161 is 16110566.

It can be written as a sum of positive squares in 4 ways, for example, as 40081561 + 26419600 = 6331^2 + 5140^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66501161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66501161.

It is not an unprimeable number, because it can be changed into a prime (66501131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28121 + ... + 30393.

It is an arithmetic number, because the mean of its divisors is an integer number (8810613).

Almost surely, 2^66501161 is an apocalyptic number.

It is an amenable number.

66501161 is a deficient number, since it is larger than the sum of its proper divisors (3983743).

66501161 is a wasteful number, since it uses less digits than its factorization.

66501161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4011.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 66501161 is about 8154.8244003167. The cubic root of 66501161 is about 405.1443086819.

The spelling of 66501161 in words is "sixty-six million, five hundred one thousand, one hundred sixty-one".