640121122113 has 16 divisors (see below), whose sum is σ = 948652917696. Its totient is φ = 380632341440.

The previous prime is 640121122111. The next prime is 640121122117. The reversal of 640121122113 is 311221121046.

It is a cyclic number.

It is not a de Polignac number, because 640121122113 - 2¹ = 640121122111 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640121122111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182994570 + ... + 182998067.

It is an arithmetic number, because the mean of its divisors is an integer number (59290807356).

Almost surely, 2^640121122113 is an apocalyptic number.

It is an amenable number.

640121122113 is a deficient number, since it is larger than the sum of its proper divisors (308531795583).

640121122113 is a wasteful number, since it uses less digits than its factorization.

640121122113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365992704.

The product of its (nonzero) digits is 576, while the sum is 24.

Adding to 640121122113 its reverse (311221121046), we get a palindrome (951342243159).

The spelling of 640121122113 in words is "six hundred forty billion, one hundred twenty-one million, one hundred twenty-two thousand, one hundred thirteen".