78623103779089 has 3 divisors (see below), whose sum is σ = 78623112646057. Its totient is φ = 78623094912122.

The previous prime is 78623103779041. The next prime is 78623103779117. The reversal of 78623103779089 is 98097730132687.

It is a happy number.

The square root of 78623103779089 is 8866967.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 78623103779089 - 2¹⁵ = 78623103746321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78623103779989) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4433484 + ... + 13300450.

Almost surely, 2^{78623103779089} is an apocalyptic number.

78623103779089 is the 8866967-th square number.

78623103779089 is the 4433484-th centered octagonal number.

It is an amenable number.

78623103779089 is a deficient number, since it is larger than the sum of its proper divisors (8866968).

78623103779089 is an frugal number, since it uses more digits than its factorization.

78623103779089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17733934 (or 8866967 counting only the distinct ones).

The product of its (nonzero) digits is 192036096, while the sum is 70.

The spelling of 78623103779089 in words is "seventy-eight trillion, six hundred twenty-three billion, one hundred three million, seven hundred seventy-nine thousand, eighty-nine".