209742268635 has 48 divisors (see below), whose sum is σ = 370512387648. Its totient is φ = 109722412800.

The previous prime is 209742268577. The next prime is 209742268643. The reversal of 209742268635 is 536862247902.

209742268635 is a `hidden beast` number, since 20 + 97 + 422 + 6 + 86 + 35 = 666.

209742268635 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 209742268635 - 2¹⁸ = 209742006491 is a prime.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 11011570 + ... + 11030600.

It is an arithmetic number, because the mean of its divisors is an integer number (7719008076).

Almost surely, 2^209742268635 is an apocalyptic number.

209742268635 is a deficient number, since it is larger than the sum of its proper divisors (160770119013).

209742268635 is a wasteful number, since it uses less digits than its factorization.

209742268635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23716 (or 23713 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 54.

The spelling of 209742268635 in words is "two hundred nine billion, seven hundred forty-two million, two hundred sixty-eight thousand, six hundred thirty-five".