78340636623 has 4 divisors (see below), whose sum is σ = 104454182168. Its totient is φ = 52227091080.

The previous prime is 78340636601. The next prime is 78340636643. The reversal of 78340636623 is 32663604387.

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

It is not a de Polignac number, because 78340636623 - 2¹⁰ = 78340635599 is a prime.

It is a super-2 number, since 2×78340636623² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78340636643) 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, 13056772768 + ... + 13056772773.

It is an arithmetic number, because the mean of its divisors is an integer number (26113545542).

Almost surely, 2^78340636623 is an apocalyptic number.

78340636623 is a deficient number, since it is larger than the sum of its proper divisors (26113545545).

78340636623 is a wasteful number, since it uses less digits than its factorization.

78340636623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26113545544.

The product of its (nonzero) digits is 2612736, while the sum is 48.

The spelling of 78340636623 in words is "seventy-eight billion, three hundred forty million, six hundred thirty-six thousand, six hundred twenty-three".