1661120117 has 8 divisors (see below), whose sum is σ = 1696412160. Its totient is φ = 1625974480.

The previous prime is 1661120059. The next prime is 1661120129. The reversal of 1661120117 is 7110211661.

It is a happy number.

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 1661120117 - 2¹⁰ = 1661119093 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 (1661120137) 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, 13517 + ... + 59202.

It is an arithmetic number, because the mean of its divisors is an integer number (212051520).

Almost surely, 2^1661120117 is an apocalyptic number.

It is an amenable number.

1661120117 is a deficient number, since it is larger than the sum of its proper divisors (35292043).

1661120117 is an equidigital number, since it uses as much as digits as its factorization.

1661120117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73203.

The product of its (nonzero) digits is 504, while the sum is 26.

The square root of 1661120117 is about 40756.8413520970. The cubic root of 1661120117 is about 1184.3144074347.

Adding to 1661120117 its reverse (7110211661), we get a palindrome (8771331778).

The spelling of 1661120117 in words is "one billion, six hundred sixty-one million, one hundred twenty thousand, one hundred seventeen".