12916402640 has 40 divisors (see below), whose sum is σ = 30246709920. Its totient is φ = 5129387136.

The previous prime is 12916402633. The next prime is 12916402649. The reversal of 12916402640 is 4620461921.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 12916402640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12916402649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 569654 + ... + 591893.

It is an arithmetic number, because the mean of its divisors is an integer number (756167748).

Almost surely, 2^12916402640 is an apocalyptic number.

12916402640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12916402640 is an abundant number, since it is smaller than the sum of its proper divisors (17330307280).

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

12916402640 is a wasteful number, since it uses less digits than its factorization.

12916402640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1161699 (or 1161693 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The spelling of 12916402640 in words is "twelve billion, nine hundred sixteen million, four hundred two thousand, six hundred forty".