9661739657 has 4 divisors (see below), whose sum is σ = 9692806656. Its totient is φ = 9630672660.

The previous prime is 9661739627. The next prime is 9661739669. The reversal of 9661739657 is 7569371669.

9661739657 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9661739657 - 2¹⁰ = 9661738633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9661739596 and 9661739605.

It is not an unprimeable number, because it can be changed into a prime (9661739627) 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, 15533033 + ... + 15533654.

It is an arithmetic number, because the mean of its divisors is an integer number (2423201664).

Almost surely, 2^9661739657 is an apocalyptic number.

It is an amenable number.

9661739657 is a deficient number, since it is larger than the sum of its proper divisors (31066999).

9661739657 is a wasteful number, since it uses less digits than its factorization.

9661739657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31066998.

The product of its digits is 12859560, while the sum is 59.

The square root of 9661739657 is about 98294.1486406999. The cubic root of 9661739657 is about 2129.8635292816.

The spelling of 9661739657 in words is "nine billion, six hundred sixty-one million, seven hundred thirty-nine thousand, six hundred fifty-seven".