1661100307 has 4 divisors (see below), whose sum is σ = 1661284296. Its totient is φ = 1660916320.

The previous prime is 1661100299. The next prime is 1661100313. The reversal of 1661100307 is 7030011661.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1661100307 - 2³ = 1661100299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1661100317) 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, 77713 + ... + 96754.

It is an arithmetic number, because the mean of its divisors is an integer number (415321074).

Almost surely, 2^1661100307 is an apocalyptic number.

1661100307 is a deficient number, since it is larger than the sum of its proper divisors (183989).

1661100307 is an equidigital number, since it uses as much as digits as its factorization.

1661100307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183988.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 1661100307 is about 40756.5983246885. The cubic root of 1661100307 is about 1184.3096994947.

Adding to 1661100307 its reverse (7030011661), we get a palindrome (8691111968).

The spelling of 1661100307 in words is "one billion, six hundred sixty-one million, one hundred thousand, three hundred seven".