866610961 has 4 divisors (see below), whose sum is σ = 877580800. Its totient is φ = 855641124.

The previous prime is 866610937. The next prime is 866610977. The reversal of 866610961 is 169016668.

It is a happy number.

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 866610961 - 2¹³ = 866602769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866610911) 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, 5484801 + ... + 5484958.

It is an arithmetic number, because the mean of its divisors is an integer number (219395200).

Almost surely, 2^866610961 is an apocalyptic number.

It is an amenable number.

866610961 is a deficient number, since it is larger than the sum of its proper divisors (10969839).

866610961 is a wasteful number, since it uses less digits than its factorization.

866610961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10969838.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 866610961 is about 29438.2567588504. The cubic root of 866610961 is about 953.3990742994.

The spelling of 866610961 in words is "eight hundred sixty-six million, six hundred ten thousand, nine hundred sixty-one".