1661000113 has 8 divisors (see below), whose sum is σ = 1766596608. Its totient is φ = 1556280384.

The previous prime is 1661000111. The next prime is 1661000123. The reversal of 1661000113 is 3110001661.

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 1661000113 - 2¹ = 1661000111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1661000111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215281 + ... + 222862.

It is an arithmetic number, because the mean of its divisors is an integer number (220824576).

Almost surely, 2^1661000113 is an apocalyptic number.

It is an amenable number.

1661000113 is a deficient number, since it is larger than the sum of its proper divisors (105596495).

1661000113 is a wasteful number, since it uses less digits than its factorization.

1661000113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438383.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 1661000113 is about 40755.3691309501. The cubic root of 1661000113 is about 1184.2858873441.

Adding to 1661000113 its reverse (3110001661), we get a palindrome (4771001774).

The spelling of 1661000113 in words is "one billion, six hundred sixty-one million, one hundred thirteen", and thus it is an aban number.