9613641661 has 32 divisors (see below), whose sum is σ = 11449831680. Its totient is φ = 7988253696.

The previous prime is 9613641647. The next prime is 9613641677. The reversal of 9613641661 is 1661463169.

9613641661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 9613641661 - 2⁵ = 9613641629 is a prime.

It is a super-2 number, since 2×9613641661² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9613641691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 472480 + ... + 492406.

It is an arithmetic number, because the mean of its divisors is an integer number (357807240).

Almost surely, 2^9613641661 is an apocalyptic number.

It is an amenable number.

9613641661 is a deficient number, since it is larger than the sum of its proper divisors (1836190019).

9613641661 is a wasteful number, since it uses less digits than its factorization.

9613641661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20053.

The product of its digits is 139968, while the sum is 43.

The square root of 9613641661 is about 98049.1798078903. The cubic root of 9613641661 is about 2126.3233582867.

The spelling of 9613641661 in words is "nine billion, six hundred thirteen million, six hundred forty-one thousand, six hundred sixty-one".