645601544135 has 16 divisors (see below), whose sum is σ = 779212224000. Its totient is φ = 513491638176.

The previous prime is 645601544117. The next prime is 645601544213. The reversal of 645601544135 is 531445106546.

It is a cyclic number.

It is not a de Polignac number, because 645601544135 - 2¹⁴ = 645601527751 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, 1052246 + ... + 1548684.

It is an arithmetic number, because the mean of its divisors is an integer number (48700764000).

Almost surely, 2^645601544135 is an apocalyptic number.

645601544135 is a deficient number, since it is larger than the sum of its proper divisors (133610679865).

645601544135 is a wasteful number, since it uses less digits than its factorization.

645601544135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497950.

The product of its (nonzero) digits is 864000, while the sum is 44.

The spelling of 645601544135 in words is "six hundred forty-five billion, six hundred one million, five hundred forty-four thousand, one hundred thirty-five".