1661135306 has 16 divisors (see below), whose sum is σ = 2638560960. Its totient is φ = 782138880.

The previous prime is 1661135299. The next prime is 1661135327. The reversal of 1661135306 is 6035311661.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124535 + ... + 137226.

It is an arithmetic number, because the mean of its divisors is an integer number (164910060).

Almost surely, 2^1661135306 is an apocalyptic number.

1661135306 is a deficient number, since it is larger than the sum of its proper divisors (977425654).

1661135306 is a wasteful number, since it uses less digits than its factorization.

1661135306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261949.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 1661135306 is about 40757.0276884858. The cubic root of 1661135306 is about 1184.3180171469.

Adding to 1661135306 its reverse (6035311661), we get a palindrome (7696446967).

The spelling of 1661135306 in words is "one billion, six hundred sixty-one million, one hundred thirty-five thousand, three hundred six".