860666649 has 4 divisors (see below), whose sum is σ = 1147555536. Its totient is φ = 573777764.

The previous prime is 860666593. The next prime is 860666663. The reversal of 860666649 is 946666068.

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 a de Polignac number, because none of the positive numbers 2^k-860666649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (860666699) 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, 143444439 + ... + 143444444.

It is an arithmetic number, because the mean of its divisors is an integer number (286888884).

Almost surely, 2^860666649 is an apocalyptic number.

It is an amenable number.

860666649 is a deficient number, since it is larger than the sum of its proper divisors (286888887).

860666649 is a wasteful number, since it uses less digits than its factorization.

860666649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286888886.

The product of its (nonzero) digits is 2239488, while the sum is 51.

The square root of 860666649 is about 29337.1206664867. The cubic root of 860666649 is about 951.2141996343.

The spelling of 860666649 in words is "eight hundred sixty million, six hundred sixty-six thousand, six hundred forty-nine".