78589946618 has 4 divisors (see below), whose sum is σ = 117884919930. Its totient is φ = 39294973308.

The previous prime is 78589946609. The next prime is 78589946627. The reversal of 78589946618 is 81664998587.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (78589946609) and next prime (78589946627).

It can be written as a sum of positive squares in only one way, i.e., 54902581969 + 23687364649 = 234313^2 + 153907^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19647486653 + ... + 19647486656.

Almost surely, 2^78589946618 is an apocalyptic number.

78589946618 is a deficient number, since it is larger than the sum of its proper divisors (39294973312).

78589946618 is a wasteful number, since it uses less digits than its factorization.

78589946618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39294973311.

The product of its digits is 209018880, while the sum is 71.

The spelling of 78589946618 in words is "seventy-eight billion, five hundred eighty-nine million, nine hundred forty-six thousand, six hundred eighteen".