78171535456 has 96 divisors (see below), whose sum is σ = 180647288640. Its totient is φ = 32599449600.

The previous prime is 78171535417. The next prime is 78171535457. The reversal of 78171535456 is 65453517187.

It is a super-2 number, since 2×78171535456² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78171535457) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3561636 + ... + 3583516.

It is an arithmetic number, because the mean of its divisors is an integer number (1881742590).

Almost surely, 2^78171535456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78171535456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90323644320).

78171535456 is an abundant number, since it is smaller than the sum of its proper divisors (102475753184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78171535456 is a wasteful number, since it uses less digits than its factorization.

78171535456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22328 (or 22320 counting only the distinct ones).

The product of its digits is 3528000, while the sum is 52.

The spelling of 78171535456 in words is "seventy-eight billion, one hundred seventy-one million, five hundred thirty-five thousand, four hundred fifty-six".