640642075535 has 32 divisors (see below), whose sum is σ = 961589325312. Its totient is φ = 398060369280.

The previous prime is 640642075529. The next prime is 640642075553. The reversal of 640642075535 is 535570246046.

It is not a de Polignac number, because 640642075535 - 2¹² = 640642071439 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 640642075535.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2591912 + ... + 2828301.

It is an arithmetic number, because the mean of its divisors is an integer number (30049666416).

Almost surely, 2^640642075535 is an apocalyptic number.

640642075535 is a deficient number, since it is larger than the sum of its proper divisors (320947249777).

640642075535 is a wasteful number, since it uses less digits than its factorization.

640642075535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5420543.

The product of its (nonzero) digits is 3024000, while the sum is 47.

The spelling of 640642075535 in words is "six hundred forty billion, six hundred forty-two million, seventy-five thousand, five hundred thirty-five".