3116401661 has 4 divisors (see below), whose sum is σ = 3151417500. Its totient is φ = 3081385824.

The previous prime is 3116401657. The next prime is 3116401711. The reversal of 3116401661 is 1661046113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1510876900 + 1605524761 = 38870^2 + 40069^2 .

It is a cyclic number.

It is not a de Polignac number, because 3116401661 - 2² = 3116401657 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 (3116406661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17507786 + ... + 17507963.

It is an arithmetic number, because the mean of its divisors is an integer number (787854375).

Almost surely, 2^3116401661 is an apocalyptic number.

It is an amenable number.

3116401661 is a deficient number, since it is larger than the sum of its proper divisors (35015839).

3116401661 is an equidigital number, since it uses as much as digits as its factorization.

3116401661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35015838.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 3116401661 is about 55824.7405815737. The cubic root of 3116401661 is about 1460.6667469769. Note that the first 3 decimals are identical.

Adding to 3116401661 its reverse (1661046113), we get a palindrome (4777447774).

The spelling of 3116401661 in words is "three billion, one hundred sixteen million, four hundred one thousand, six hundred sixty-one".