12640281054 has 16 divisors (see below), whose sum is σ = 25288232592. Its totient is φ = 4212148608.

The previous prime is 12640281053. The next prime is 12640281079. The reversal of 12640281054 is 45018204621.

It is a happy number.

It is a super-2 number, since 2×12640281054² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12640281053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 298069 + ... + 337824.

It is an arithmetic number, because the mean of its divisors is an integer number (1580514537).

Almost surely, 2^12640281054 is an apocalyptic number.

12640281054 is an abundant number, since it is smaller than the sum of its proper divisors (12647951538).

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

12640281054 is a wasteful number, since it uses less digits than its factorization.

12640281054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639211.

The product of its (nonzero) digits is 15360, while the sum is 33.

Adding to 12640281054 its reverse (45018204621), we get a palindrome (57658485675).

The spelling of 12640281054 in words is "twelve billion, six hundred forty million, two hundred eighty-one thousand, fifty-four".