12547742578 has 16 divisors (see below), whose sum is σ = 21863047104. Its totient is φ = 5289446160.

The previous prime is 12547742569. The next prime is 12547742593. The reversal of 12547742578 is 87524774521.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7345600 + ... + 7347307.

It is an arithmetic number, because the mean of its divisors is an integer number (1366440444).

Almost surely, 2^12547742578 is an apocalyptic number.

12547742578 is a deficient number, since it is larger than the sum of its proper divisors (9315304526).

12547742578 is a wasteful number, since it uses less digits than its factorization.

12547742578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14692977.

The product of its digits is 4390400, while the sum is 52.

The spelling of 12547742578 in words is "twelve billion, five hundred forty-seven million, seven hundred forty-two thousand, five hundred seventy-eight".