1661050115 has 4 divisors (see below), whose sum is σ = 1993260144. Its totient is φ = 1328840088.

The previous prime is 1661050099. The next prime is 1661050117. The reversal of 1661050115 is 5110501661.

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 1661050115 - 2⁴ = 1661050099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1661050117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166105007 + ... + 166105016.

It is an arithmetic number, because the mean of its divisors is an integer number (498315036).

Almost surely, 2^1661050115 is an apocalyptic number.

1661050115 is a deficient number, since it is larger than the sum of its proper divisors (332210029).

1661050115 is an equidigital number, since it uses as much as digits as its factorization.

1661050115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332210028.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 1661050115 is about 40755.9825669803. The cubic root of 1661050115 is about 1184.2977709614.

Adding to 1661050115 its reverse (5110501661), we get a palindrome (6771551776).

The spelling of 1661050115 in words is "one billion, six hundred sixty-one million, fifty thousand, one hundred fifteen".