66109361 has 4 divisors (see below), whose sum is σ = 67646832. Its totient is φ = 64571892.

The previous prime is 66109339. The next prime is 66109397. The reversal of 66109361 is 16390166.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66109361 is a prime.

It is a super-2 number, since 2×66109361² = 8740895223656642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66109301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 768671 + ... + 768756.

It is an arithmetic number, because the mean of its divisors is an integer number (16911708).

Almost surely, 2^66109361 is an apocalyptic number.

It is an amenable number.

66109361 is a deficient number, since it is larger than the sum of its proper divisors (1537471).

66109361 is a wasteful number, since it uses less digits than its factorization.

66109361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1537470.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 66109361 is about 8130.7663230473. The cubic root of 66109361 is about 404.3470880070.

The spelling of 66109361 in words is "sixty-six million, one hundred nine thousand, three hundred sixty-one".