9640963691 has 4 divisors (see below), whose sum is σ = 9776751984. Its totient is φ = 9505175400.

The previous prime is 9640963669. The next prime is 9640963697. The reversal of 9640963691 is 1963690469.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1963690469 = 13 ⋅151053113.

It is a cyclic number.

It is not a de Polignac number, because 9640963691 - 2⁶ = 9640963627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9640963697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67894040 + ... + 67894181.

It is an arithmetic number, because the mean of its divisors is an integer number (2444187996).

Almost surely, 2^9640963691 is an apocalyptic number.

9640963691 is a deficient number, since it is larger than the sum of its proper divisors (135788293).

9640963691 is a wasteful number, since it uses less digits than its factorization.

9640963691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135788292.

The product of its (nonzero) digits is 1889568, while the sum is 53.

The square root of 9640963691 is about 98188.4091479234. The cubic root of 9640963691 is about 2128.3357944847.

The spelling of 9640963691 in words is "nine billion, six hundred forty million, nine hundred sixty-three thousand, six hundred ninety-one".