9661120681 has 9 divisors (see below), whose sum is σ = 9726330711. Its totient is φ = 9596346912.

The previous prime is 9661120669. The next prime is 9661120691. The reversal of 9661120681 is 1860211669.

The square root of 9661120681 is 98291.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1083397225 + 8577723456 = 32915^2 + 92616^2 .

It is not a de Polignac number, because 9661120681 - 2¹¹ = 9661118633 is a prime.

It is a super-2 number, since 2×9661120681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9661120691) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 22311841 + ... + 22312273.

Almost surely, 2^9661120681 is an apocalyptic number.

9661120681 is the 98291-st square number.

9661120681 is the 49146-th centered octagonal number.

It is an amenable number.

9661120681 is a deficient number, since it is larger than the sum of its proper divisors (65210030).

9661120681 is an frugal number, since it uses more digits than its factorization.

9661120681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320 (or 660 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The cubic root of 9661120681 is about 2129.8180453209.

The spelling of 9661120681 in words is "nine billion, six hundred sixty-one million, one hundred twenty thousand, six hundred eighty-one".