66361771 has 8 divisors (see below), whose sum is σ = 77606144. Its totient is φ = 55558440.

The previous prime is 66361759. The next prime is 66361781. The reversal of 66361771 is 17716366.

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

It is not a de Polignac number, because 66361771 - 2⁷ = 66361643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66361771.

It is not an unprimeable number, because it can be changed into a prime (66361781) 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, 109935 + ... + 110536.

It is an arithmetic number, because the mean of its divisors is an integer number (9700768).

Almost surely, 2^66361771 is an apocalyptic number.

66361771 is a deficient number, since it is larger than the sum of its proper divisors (11244373).

66361771 is a wasteful number, since it uses less digits than its factorization.

66361771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220521.

The product of its digits is 31752, while the sum is 37.

The square root of 66361771 is about 8146.2734425012. The cubic root of 66361771 is about 404.8610426095.

The spelling of 66361771 in words is "sixty-six million, three hundred sixty-one thousand, seven hundred seventy-one".