9641409661 has 8 divisors (see below), whose sum is σ = 10458847224. Its totient is φ = 8834799360.

The previous prime is 9641409607. The next prime is 9641409667. The reversal of 9641409661 is 1669041469.

It can be written as a sum of positive squares in 4 ways, for example, as 55041561 + 9586368100 = 7419^2 + 97910^2 .

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 9641409661 - 2²¹ = 9639312509 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 (9641409667) 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, 2704960 + ... + 2708521.

It is an arithmetic number, because the mean of its divisors is an integer number (1307355903).

Almost surely, 2^9641409661 is an apocalyptic number.

It is an amenable number.

9641409661 is a deficient number, since it is larger than the sum of its proper divisors (817437563).

9641409661 is a wasteful number, since it uses less digits than its factorization.

9641409661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5413631.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 9641409661 is about 98190.6801127276. The cubic root of 9641409661 is about 2128.3686113728.

The spelling of 9641409661 in words is "nine billion, six hundred forty-one million, four hundred nine thousand, six hundred sixty-one".