611407661 has 4 divisors (see below), whose sum is σ = 618277500. Its totient is φ = 604537824.

The previous prime is 611407639. The next prime is 611407663. The reversal of 611407661 is 166704116.

It is a happy number.

611407661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 226502500 + 384905161 = 15050^2 + 19619^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-611407661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (611407663) 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, 3434786 + ... + 3434963.

It is an arithmetic number, because the mean of its divisors is an integer number (154569375).

Almost surely, 2^611407661 is an apocalyptic number.

It is an amenable number.

611407661 is a deficient number, since it is larger than the sum of its proper divisors (6869839).

611407661 is an equidigital number, since it uses as much as digits as its factorization.

611407661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6869838.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 611407661 is about 24726.6589130032. The cubic root of 611407661 is about 848.7444721042.

The spelling of 611407661 in words is "six hundred eleven million, four hundred seven thousand, six hundred sixty-one".