11661021654025 has 6 divisors (see below), whose sum is σ = 14459666851022. Its totient is φ = 9328817323200.

The previous prime is 11661021654011. The next prime is 11661021654077. The reversal of 11661021654025 is 52045612016611.

It can be written as a sum of positive squares in 3 ways, for example, as 260323427961 + 11400698226064 = 510219^2 + 3376492^2 .

It is not a de Polignac number, because 11661021654025 - 2⁵ = 11661021653993 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 233220433056 + ... + 233220433105.

Almost surely, 2^{11661021654025} is an apocalyptic number.

It is an amenable number.

11661021654025 is a deficient number, since it is larger than the sum of its proper divisors (2798645196997).

11661021654025 is an equidigital number, since it uses as much as digits as its factorization.

11661021654025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466440866171 (or 466440866166 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 40.

The spelling of 11661021654025 in words is "eleven trillion, six hundred sixty-one billion, twenty-one million, six hundred fifty-four thousand, twenty-five".