1578531157056 has 392 divisors, whose sum is σ = 5552484419520. Its totient is φ = 435454258176.

The previous prime is 1578531157039. The next prime is 1578531157079. The reversal of 1578531157056 is 6507511358751.

It is a happy number.

1578531157056 is a `hidden beast` number, since 1 + 5 + 7 + 8 + 5 + 3 + 11 + 570 + 56 = 666.

It is a super-2 number, since 2×1578531157056² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 1578531156993 and 1578531157011.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 9387835 + ... + 9554501.

Almost surely, 2^{1578531157056} is an apocalyptic number.

1578531157056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1578531157056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2776242209760).

1578531157056 is an abundant number, since it is smaller than the sum of its proper divisors (3973953262464).

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

1578531157056 is an equidigital number, since it uses as much as digits as its factorization.

1578531157056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166733 (or 166708 counting only the distinct ones).

The product of its (nonzero) digits is 4410000, while the sum is 54.

The spelling of 1578531157056 in words is "one trillion, five hundred seventy-eight billion, five hundred thirty-one million, one hundred fifty-seven thousand, fifty-six".