1661054317 has 8 divisors (see below), whose sum is σ = 1819147680. Its totient is φ = 1507292400.

The previous prime is 1661054299. The next prime is 1661054327. The reversal of 1661054317 is 7134501661.

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 1661054317 - 2⁷ = 1661054189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661054327) 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, 1082059 + ... + 1083592.

It is an arithmetic number, because the mean of its divisors is an integer number (227393460).

Almost surely, 2^1661054317 is an apocalyptic number.

It is an amenable number.

1661054317 is a deficient number, since it is larger than the sum of its proper divisors (158093363).

1661054317 is a wasteful number, since it uses less digits than its factorization.

1661054317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2165723.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 1661054317 is about 40756.0341176616. The cubic root of 1661054317 is about 1184.2987696098.

Adding to 1661054317 its reverse (7134501661), we get a palindrome (8795555978).

The spelling of 1661054317 in words is "one billion, six hundred sixty-one million, fifty-four thousand, three hundred seventeen".