1661433115 has 4 divisors (see below), whose sum is σ = 1993719744. Its totient is φ = 1329146488.

The previous prime is 1661433107. The next prime is 1661433143. The reversal of 1661433115 is 5113341661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5113341661 = 4561 ⋅1121101.

It is a cyclic number.

It is not a de Polignac number, because 1661433115 - 2³ = 1661433107 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166143307 + ... + 166143316.

It is an arithmetic number, because the mean of its divisors is an integer number (498429936).

Almost surely, 2^1661433115 is an apocalyptic number.

1661433115 is a deficient number, since it is larger than the sum of its proper divisors (332286629).

1661433115 is an equidigital number, since it uses as much as digits as its factorization.

1661433115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332286628.

The product of its digits is 6480, while the sum is 31.

The square root of 1661433115 is about 40760.6809928392. The cubic root of 1661433115 is about 1184.3887879200.

Adding to 1661433115 its reverse (5113341661), we get a palindrome (6774774776).

It can be divided in two parts, 16614 and 33115, that added together give a square (49729 = 223²).

The spelling of 1661433115 in words is "one billion, six hundred sixty-one million, four hundred thirty-three thousand, one hundred fifteen".