9661025351961 has 9 divisors (see below), whose sum is σ = 13954827866239. Its totient is φ = 6440677351536.

The previous prime is 9661025351953. The next prime is 9661025351969. The reversal of 9661025351961 is 1691535201669.

The square root of 9661025351961 is 3108219.

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

9661025351961 is a `hidden beast` number, since 9 + 6 + 6 + 10 + 2 + 53 + 519 + 61 = 666.

It is an interprime number because it is at equal distance from previous prime (9661025351953) and next prime (9661025351969).

It can be written as a sum of positive squares in only one way, i.e., 1455413024025 + 8205612327936 = 1206405^2 + 2864544^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 9661025351961 - 2³ = 9661025351953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9661025351898 and 9661025351907.

It is not an unprimeable number, because it can be changed into a prime (9661025351969) 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, 8806621 + ... + 9842693.

Almost surely, 2^{9661025351961} is an apocalyptic number.

9661025351961 is the 3108219-th square number.

9661025351961 is the 1554110-th centered octagonal number.

It is an amenable number.

9661025351961 is a deficient number, since it is larger than the sum of its proper divisors (4293802514278).

9661025351961 is an frugal number, since it uses more digits than its factorization.

9661025351961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2072152 (or 1036076 counting only the distinct ones).

The product of its (nonzero) digits is 2624400, while the sum is 54.

The spelling of 9661025351961 in words is "nine trillion, six hundred sixty-one billion, twenty-five million, three hundred fifty-one thousand, nine hundred sixty-one".