66240544535 has 16 divisors (see below), whose sum is σ = 88351028640. Its totient is φ = 47265978240.

The previous prime is 66240544511. The next prime is 66240544541. The reversal of 66240544535 is 53544504266.

It is a happy number.

It is not a de Polignac number, because 66240544535 - 2²² = 66236350231 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11359100 + ... + 11364929.

It is an arithmetic number, because the mean of its divisors is an integer number (5521939290).

Almost surely, 2^66240544535 is an apocalyptic number.

66240544535 is a deficient number, since it is larger than the sum of its proper divisors (22110484105).

66240544535 is a wasteful number, since it uses less digits than its factorization.

66240544535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22724098.

The product of its (nonzero) digits is 1728000, while the sum is 44.

The spelling of 66240544535 in words is "sixty-six billion, two hundred forty million, five hundred forty-four thousand, five hundred thirty-five".