78225938471 has 4 divisors (see below), whose sum is σ = 78226502232. Its totient is φ = 78225374712.

The previous prime is 78225938449. The next prime is 78225938477. The reversal of 78225938471 is 17483952287.

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, and also an emirpimes, since its reverse is a distinct semiprime: 17483952287 = 37 ⋅472539251.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78225938471 is a prime.

It is a super-3 number, since 3×78225938471³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78225938477) 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, 88325 + ... + 405281.

It is an arithmetic number, because the mean of its divisors is an integer number (19556625558).

Almost surely, 2^78225938471 is an apocalyptic number.

78225938471 is a deficient number, since it is larger than the sum of its proper divisors (563761).

78225938471 is a wasteful number, since it uses less digits than its factorization.

78225938471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563760.

The product of its digits is 6773760, while the sum is 56.

The spelling of 78225938471 in words is "seventy-eight billion, two hundred twenty-five million, nine hundred thirty-eight thousand, four hundred seventy-one".