78421171075 has 24 divisors (see below), whose sum is σ = 104961164000. Its totient is φ = 57778997760.

The previous prime is 78421171067. The next prime is 78421171123. The reversal of 78421171075 is 57017112487.

It is not a de Polignac number, because 78421171075 - 2³ = 78421171067 is a prime.

It is a super-3 number, since 3×78421171075³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 132150 + ... + 417499.

Almost surely, 2^78421171075 is an apocalyptic number.

78421171075 is a deficient number, since it is larger than the sum of its proper divisors (26539992925).

78421171075 is a wasteful number, since it uses less digits than its factorization.

78421171075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550111 (or 550106 counting only the distinct ones).

The product of its (nonzero) digits is 109760, while the sum is 43.

The spelling of 78421171075 in words is "seventy-eight billion, four hundred twenty-one million, one hundred seventy-one thousand, seventy-five".