78785500324172 has 6 divisors (see below), whose sum is σ = 137874625567308. Its totient is φ = 39392750162084.

The previous prime is 78785500324147. The next prime is 78785500324217. The reversal of 78785500324172 is 27142300558787.

It is a super-2 number, since 2×78785500324172² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9848187540518 + ... + 9848187540525.

It is an arithmetic number, because the mean of its divisors is an integer number (22979104261218).

Almost surely, 2^{78785500324172} is an apocalyptic number.

It is an amenable number.

78785500324172 is a deficient number, since it is larger than the sum of its proper divisors (59089125243136).

78785500324172 is a wasteful number, since it uses less digits than its factorization.

78785500324172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19696375081047 (or 19696375081045 counting only the distinct ones).

The product of its (nonzero) digits is 26342400, while the sum is 59.

The spelling of 78785500324172 in words is "seventy-eight trillion, seven hundred eighty-five billion, five hundred million, three hundred twenty-four thousand, one hundred seventy-two".