640336632145 has 8 divisors (see below), whose sum is σ = 878175952704. Its totient is φ = 439087976304.

The previous prime is 640336632139. The next prime is 640336632181. The reversal of 640336632145 is 541236633046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 640336632145 - 2¹⁹ = 640336107857 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9147666139 + ... + 9147666208.

It is an arithmetic number, because the mean of its divisors is an integer number (109771994088).

Almost surely, 2^640336632145 is an apocalyptic number.

It is an amenable number.

640336632145 is a deficient number, since it is larger than the sum of its proper divisors (237839320559).

640336632145 is a wasteful number, since it uses less digits than its factorization.

640336632145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18295332359.

The product of its (nonzero) digits is 933120, while the sum is 43.

Subtracting from 640336632145 its reverse (541236633046), we obtain a palindrome (99099999099).

The spelling of 640336632145 in words is "six hundred forty billion, three hundred thirty-six million, six hundred thirty-two thousand, one hundred forty-five".