66193601 has 4 divisors (see below), whose sum is σ = 67278804. Its totient is φ = 65108400.

The previous prime is 66193583. The next prime is 66193613. The reversal of 66193601 is 10639166.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1809025 + 64384576 = 1345^2 + 8024^2 .

It is a cyclic number.

It is not a de Polignac number, because 66193601 - 2²² = 61999297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66193901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 542510 + ... + 542631.

It is an arithmetic number, because the mean of its divisors is an integer number (16819701).

Almost surely, 2^66193601 is an apocalyptic number.

66193601 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

66193601 is a deficient number, since it is larger than the sum of its proper divisors (1085203).

66193601 is a wasteful number, since it uses less digits than its factorization.

66193601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085202.

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

The square root of 66193601 is about 8135.9449973559. The cubic root of 66193601 is about 404.5187618338.

The spelling of 66193601 in words is "sixty-six million, one hundred ninety-three thousand, six hundred one".