10661360556545 has 8 divisors (see below), whose sum is σ = 12825858445224. Its totient is φ = 8507604593664.

The previous prime is 10661360556527. The next prime is 10661360556643. The reversal of 10661360556545 is 54565506316601.

It can be written as a sum of positive squares in 4 ways, for example, as 1155478804624 + 9505881751921 = 1074932^2 + 3083161^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 10661360556545 - 2¹⁴ = 10661360540161 is a prime.

It is a super-2 number, since 2×10661360556545² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2685479264 + ... + 2685483233.

It is an arithmetic number, because the mean of its divisors is an integer number (1603232305653).

Almost surely, 2^{10661360556545} is an apocalyptic number.

It is an amenable number.

10661360556545 is a deficient number, since it is larger than the sum of its proper divisors (2164497888679).

10661360556545 is an equidigital number, since it uses as much as digits as its factorization.

10661360556545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5370962899.

The product of its (nonzero) digits is 9720000, while the sum is 53.

The spelling of 10661360556545 in words is "ten trillion, six hundred sixty-one billion, three hundred sixty million, five hundred fifty-six thousand, five hundred forty-five".