610556661 has 48 divisors (see below), whose sum is σ = 1055763072. Its totient is φ = 335088000.

The previous prime is 610556657. The next prime is 610556701. The reversal of 610556661 is 166655016.

610556661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 610556661 - 2² = 610556657 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (610556641) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 63736 + ... + 72686.

It is an arithmetic number, because the mean of its divisors is an integer number (21995064).

Almost surely, 2^610556661 is an apocalyptic number.

It is an amenable number.

610556661 is a deficient number, since it is larger than the sum of its proper divisors (445206411).

610556661 is a wasteful number, since it uses less digits than its factorization.

610556661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9034 (or 9031 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 610556661 is about 24709.4447732036. Note that the first 3 decimals coincide. The cubic root of 610556661 is about 848.3505086008.

The spelling of 610556661 in words is "six hundred ten million, five hundred fifty-six thousand, six hundred sixty-one".