8457775817478 has 128 divisors (see below), whose sum is σ = 19032178193280. Its totient is φ = 2487734108160.

The previous prime is 8457775817471. The next prime is 8457775817479. The reversal of 8457775817478 is 8747185777548.

It is a Harshad number since it is a multiple of its sum of digits (78).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8457775817471) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 243575158 + ... + 243609878.

It is an arithmetic number, because the mean of its divisors is an integer number (148688892135).

Almost surely, 2^{8457775817478} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8457775817478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9516089096640).

8457775817478 is an abundant number, since it is smaller than the sum of its proper divisors (10574402375802).

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

8457775817478 is a wasteful number, since it uses less digits than its factorization.

8457775817478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35834.

The product of its digits is 3442073600, while the sum is 78.

The spelling of 8457775817478 in words is "eight trillion, four hundred fifty-seven billion, seven hundred seventy-five million, eight hundred seventeen thousand, four hundred seventy-eight".