866126761820618 has 4 divisors (see below), whose sum is σ = 1299190142730930. Its totient is φ = 433063380910308.

The previous prime is 866126761820597. The next prime is 866126761820653. The reversal of 866126761820618 is 816028167621668.

866126761820618 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.

It can be written as a sum of positive squares in only one way, i.e., 811725855584809 + 54400906235809 = 28490803^2 + 7375697^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 216531690455153 + ... + 216531690455156.

Almost surely, 2^{866126761820618} is an apocalyptic number.

866126761820618 is a deficient number, since it is larger than the sum of its proper divisors (433063380910312).

866126761820618 is a wasteful number, since it uses less digits than its factorization.

866126761820618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433063380910311.

The product of its (nonzero) digits is 111476736, while the sum is 68.

The spelling of 866126761820618 in words is "eight hundred sixty-six trillion, one hundred twenty-six billion, seven hundred sixty-one million, eight hundred twenty thousand, six hundred eighteen".