66091369 has 8 divisors (see below), whose sum is σ = 66607688. Its totient is φ = 65577600.

The previous prime is 66091357. The next prime is 66091373. The reversal of 66091369 is 96319066.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 14538969 + 51552400 = 3813^2 + 7180^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 66091369 - 2²³ = 57702761 is a prime.

It is a super-2 number, since 2×66091369² = 8736138112588322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66091309) 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, 109669 + ... + 110269.

It is an arithmetic number, because the mean of its divisors is an integer number (8325961).

Almost surely, 2^66091369 is an apocalyptic number.

It is an amenable number.

66091369 is a deficient number, since it is larger than the sum of its proper divisors (516319).

66091369 is a wasteful number, since it uses less digits than its factorization.

66091369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275.

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 66091369 is about 8129.6598329819. The cubic root of 66091369 is about 404.3104029709.

It can be divided in two parts, 660 and 91369, that added together give a palindrome (92029).

The spelling of 66091369 in words is "sixty-six million, ninety-one thousand, three hundred sixty-nine".