12640280043 has 32 divisors (see below), whose sum is σ = 18218914560. Its totient is φ = 7769502720.

The previous prime is 12640280021. The next prime is 12640280053. The reversal of 12640280043 is 34008204621.

It is not a de Polignac number, because 12640280043 - 2¹⁴ = 12640263659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12640280053) 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, 679555 + ... + 697907.

It is an arithmetic number, because the mean of its divisors is an integer number (569341080).

Almost surely, 2^12640280043 is an apocalyptic number.

12640280043 is a deficient number, since it is larger than the sum of its proper divisors (5578634517).

12640280043 is a wasteful number, since it uses less digits than its factorization.

12640280043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18699.

The product of its (nonzero) digits is 9216, while the sum is 30.

Adding to 12640280043 its reverse (34008204621), we get a palindrome (46648484664).

The spelling of 12640280043 in words is "twelve billion, six hundred forty million, two hundred eighty thousand, forty-three".