2640185185563 has 12 divisors (see below), whose sum is σ = 3813642830088. Its totient is φ = 1760104069440.

The previous prime is 2640185185529. The next prime is 2640185185607. The reversal of 2640185185563 is 3655815810462.

2640185185563 is a `hidden beast` number, since 2 + 6 + 4 + 0 + 1 + 85 + 1 + 8 + 556 + 3 = 666.

It is not a de Polignac number, because 2640185185563 - 2⁸ = 2640185185307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2640185185763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 727470 + ... + 2410307.

It is an arithmetic number, because the mean of its divisors is an integer number (317803569174).

Almost surely, 2^{2640185185563} is an apocalyptic number.

2640185185563 is a deficient number, since it is larger than the sum of its proper divisors (1173457644525).

2640185185563 is a wasteful number, since it uses less digits than its factorization.

2640185185563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3231274 (or 3231271 counting only the distinct ones).

The product of its (nonzero) digits is 6912000, while the sum is 54.

The spelling of 2640185185563 in words is "two trillion, six hundred forty billion, one hundred eighty-five million, one hundred eighty-five thousand, five hundred sixty-three".