12578518381 has 16 divisors (see below), whose sum is σ = 14782174848. Its totient is φ = 10552104000.

The previous prime is 12578518373. The next prime is 12578518417. The reversal of 12578518381 is 18381587521.

It is a cyclic number.

It is not a de Polignac number, because 12578518381 - 2³ = 12578518373 is a prime.

It is a super-2 number, since 2×12578518381² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12578518321) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 517360 + ... + 541126.

It is an arithmetic number, because the mean of its divisors is an integer number (923885928).

Almost surely, 2^12578518381 is an apocalyptic number.

12578518381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12578518381 is a deficient number, since it is larger than the sum of its proper divisors (2203656467).

12578518381 is a wasteful number, since it uses less digits than its factorization.

12578518381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27492.

The product of its digits is 537600, while the sum is 49.

The spelling of 12578518381 in words is "twelve billion, five hundred seventy-eight million, five hundred eighteen thousand, three hundred eighty-one".