9640636855 has 4 divisors (see below), whose sum is σ = 11568764232. Its totient is φ = 7712509480.

The previous prime is 9640636849. The next prime is 9640636867. The reversal of 9640636855 is 5586360469.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 9640636855 - 2⁵ = 9640636823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 964063681 + ... + 964063690.

It is an arithmetic number, because the mean of its divisors is an integer number (2892191058).

Almost surely, 2^9640636855 is an apocalyptic number.

9640636855 is a deficient number, since it is larger than the sum of its proper divisors (1928127377).

9640636855 is a wasteful number, since it uses less digits than its factorization.

9640636855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1928127376.

The product of its (nonzero) digits is 4665600, while the sum is 52.

The square root of 9640636855 is about 98186.7448029519. The cubic root of 9640636855 is about 2128.3117434790.

The spelling of 9640636855 in words is "nine billion, six hundred forty million, six hundred thirty-six thousand, eight hundred fifty-five".