10661263000561 has 4 divisors (see below), whose sum is σ = 10661344372224. Its totient is φ = 10661181628900.

The previous prime is 10661263000547. The next prime is 10661263000571. The reversal of 10661263000561 is 16500036216601.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10661263000561 is a prime.

It is a super-2 number, since 2×10661263000561² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10661263000561.

It is not an unprimeable number, because it can be changed into a prime (10661263000541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40488985 + ... + 40751446.

It is an arithmetic number, because the mean of its divisors is an integer number (2665336093056).

Almost surely, 2^{10661263000561} is an apocalyptic number.

It is an amenable number.

10661263000561 is a deficient number, since it is larger than the sum of its proper divisors (81371663).

10661263000561 is an equidigital number, since it uses as much as digits as its factorization.

10661263000561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81371662.

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 10661263000561 in words is "ten trillion, six hundred sixty-one billion, two hundred sixty-three million, five hundred sixty-one", and thus it is an aban number.