11640780123 has 32 divisors (see below), whose sum is σ = 18242918400. Its totient is φ = 6463152000.

The previous prime is 11640780101. The next prime is 11640780157. The reversal of 11640780123 is 32108704611.

It is not a de Polignac number, because 11640780123 - 2⁸ = 11640779867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11640780223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 573553 + ... + 593501.

It is an arithmetic number, because the mean of its divisors is an integer number (570091200).

Almost surely, 2^11640780123 is an apocalyptic number.

11640780123 is a deficient number, since it is larger than the sum of its proper divisors (6602138277).

11640780123 is a wasteful number, since it uses less digits than its factorization.

11640780123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20747.

The product of its (nonzero) digits is 8064, while the sum is 33.

The spelling of 11640780123 in words is "eleven billion, six hundred forty million, seven hundred eighty thousand, one hundred twenty-three".