12567781128 has 32 divisors (see below), whose sum is σ = 35907946560. Its totient is φ = 3590794560.

The previous prime is 12567781043. The next prime is 12567781133. The reversal of 12567781128 is 82118776521.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

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, 37403943 + ... + 37404278.

It is an arithmetic number, because the mean of its divisors is an integer number (1122123330).

Almost surely, 2^12567781128 is an apocalyptic number.

It is an amenable number.

12567781128 is an abundant number, since it is smaller than the sum of its proper divisors (23340165432).

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

12567781128 is a wasteful number, since it uses less digits than its factorization.

12567781128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74808237 (or 74808233 counting only the distinct ones).

The product of its digits is 376320, while the sum is 48.

The spelling of 12567781128 in words is "twelve billion, five hundred sixty-seven million, seven hundred eighty-one thousand, one hundred twenty-eight".