12557780643 has 32 divisors (see below), whose sum is σ = 17881300800. Its totient is φ = 7811747840.

The previous prime is 12557780629. The next prime is 12557780657. The reversal of 12557780643 is 34608775521.

It is an interprime number because it is at equal distance from previous prime (12557780629) and next prime (12557780657).

It is a cyclic number.

It is not a de Polignac number, because 12557780643 - 2⁵ = 12557780611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12557780592 and 12557780601.

It is not an unprimeable number, because it can be changed into a prime (12557780623) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5143303 + ... + 5145743.

It is an arithmetic number, because the mean of its divisors is an integer number (558790650).

Almost surely, 2^12557780643 is an apocalyptic number.

12557780643 is a deficient number, since it is larger than the sum of its proper divisors (5323520157).

12557780643 is a wasteful number, since it uses less digits than its factorization.

12557780643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3287.

The product of its (nonzero) digits is 1411200, while the sum is 48.

The spelling of 12557780643 in words is "twelve billion, five hundred fifty-seven million, seven hundred eighty thousand, six hundred forty-three".