10643265108661 has 2 divisors, whose sum is σ = 10643265108662. Its totient is φ = 10643265108660.

The previous prime is 10643265108613. The next prime is 10643265108667. The reversal of 10643265108661 is 16680156234601.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10632125361636 + 11139747025 = 3260694^2 + 105545^2 .

It is a cyclic number.

It is not a de Polignac number, because 10643265108661 - 2²⁵ = 10643231554229 is a prime.

It is a super-2 number, since 2×10643265108661² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10643265108667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5321632554330 + 5321632554331.

It is an arithmetic number, because the mean of its divisors is an integer number (5321632554331).

Almost surely, 2^{10643265108661} is an apocalyptic number.

It is an amenable number.

10643265108661 is a deficient number, since it is larger than the sum of its proper divisors (1).

10643265108661 is an equidigital number, since it uses as much as digits as its factorization.

10643265108661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1244160, while the sum is 49.

The spelling of 10643265108661 in words is "ten trillion, six hundred forty-three billion, two hundred sixty-five million, one hundred eight thousand, six hundred sixty-one".