78218866675413 has 12 divisors (see below), whose sum is σ = 115114558504140. Its totient is φ = 51162026001216.

The previous prime is 78218866675393. The next prime is 78218866675421. The reversal of 78218866675413 is 31457666881287.

It can be written as a sum of positive squares in 2 ways, for example, as 27257514882129 + 50961351793284 = 5220873^2 + 7138722^2 .

It is not a de Polignac number, because 78218866675413 - 2¹² = 78218866671317 is a prime.

It is a super-2 number, since 2×78218866675413² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78218866675423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81990425808 + ... + 81990426761.

It is an arithmetic number, because the mean of its divisors is an integer number (9592879875345).

Almost surely, 2^{78218866675413} is an apocalyptic number.

It is an amenable number.

78218866675413 is a deficient number, since it is larger than the sum of its proper divisors (36895691828727).

78218866675413 is a wasteful number, since it uses less digits than its factorization.

78218866675413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163980852628 (or 163980852625 counting only the distinct ones).

The product of its digits is 650280960, while the sum is 72.

The spelling of 78218866675413 in words is "seventy-eight trillion, two hundred eighteen billion, eight hundred sixty-six million, six hundred seventy-five thousand, four hundred thirteen".