611200661 has 4 divisors (see below), whose sum is σ = 617134752. Its totient is φ = 605266572.

The previous prime is 611200633. The next prime is 611200673. The reversal of 611200661 is 166002116.

611200661 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 611200661 - 2¹⁰ = 611199637 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 (611200621) 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, 2966891 + ... + 2967096.

It is an arithmetic number, because the mean of its divisors is an integer number (154283688).

Almost surely, 2^611200661 is an apocalyptic number.

It is an amenable number.

611200661 is a deficient number, since it is larger than the sum of its proper divisors (5934091).

611200661 is a wasteful number, since it uses less digits than its factorization.

611200661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5934090.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 611200661 is about 24722.4727929874. The cubic root of 611200661 is about 848.6486768064.

Adding to 611200661 its reverse (166002116), we get a palindrome (777202777).

The spelling of 611200661 in words is "six hundred eleven million, two hundred thousand, six hundred sixty-one".