9640391567 has 8 divisors (see below), whose sum is σ = 9764485440. Its totient is φ = 9517874496.

The previous prime is 9640391561. The next prime is 9640391581. The reversal of 9640391567 is 7651930469.

It is not a de Polignac number, because 9640391567 - 2¹⁴ = 9640375183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9640391561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 483263 + ... + 502815.

It is an arithmetic number, because the mean of its divisors is an integer number (1220560680).

Almost surely, 2^9640391567 is an apocalyptic number.

9640391567 is a deficient number, since it is larger than the sum of its proper divisors (124093873).

9640391567 is an frugal number, since it uses more digits than its factorization.

9640391567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19790 (or 19632 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 50.

The square root of 9640391567 is about 98185.4957058322. The cubic root of 9640391567 is about 2128.2936930201.

The spelling of 9640391567 in words is "nine billion, six hundred forty million, three hundred ninety-one thousand, five hundred sixty-seven".