78219685522 has 72 divisors (see below), whose sum is σ = 136317807360. Its totient is φ = 33601352400.

The previous prime is 78219685483. The next prime is 78219685561. The reversal of 78219685522 is 22558691287.

It is an interprime number because it is at equal distance from previous prime (78219685483) and next prime (78219685561).

It is a super-2 number, since 2×78219685522² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 13868379 + ... + 13874017.

It is an arithmetic number, because the mean of its divisors is an integer number (1893302880).

Almost surely, 2^78219685522 is an apocalyptic number.

78219685522 is a deficient number, since it is larger than the sum of its proper divisors (58098121838).

78219685522 is a wasteful number, since it uses less digits than its factorization.

78219685522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5780 (or 5726 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 55.

The spelling of 78219685522 in words is "seventy-eight billion, two hundred nineteen million, six hundred eighty-five thousand, five hundred twenty-two".