861002666 has 8 divisors (see below), whose sum is σ = 1294501824. Its totient is φ = 429502060.

The previous prime is 861002657. The next prime is 861002687. The reversal of 861002666 is 666200168.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

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, 498560 + ... + 500283.

It is an arithmetic number, because the mean of its divisors is an integer number (161812728).

Almost surely, 2^861002666 is an apocalyptic number.

861002666 is a deficient number, since it is larger than the sum of its proper divisors (433499158).

861002666 is a wasteful number, since it uses less digits than its factorization.

861002666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999276.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 861002666 is about 29342.8469307257. The cubic root of 861002666 is about 951.3379728961.

The spelling of 861002666 in words is "eight hundred sixty-one million, two thousand, six hundred sixty-six".