10500661255505 has 4 divisors (see below), whose sum is σ = 12600793506612. Its totient is φ = 8400529004400.

The previous prime is 10500661255477. The next prime is 10500661255507. The reversal of 10500661255505 is 50555216600501.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2766260851264 + 7734400404241 = 1663208^2 + 2781079^2 .

It is not a de Polignac number, because 10500661255505 - 2¹⁰ = 10500661254481 is a prime.

It is a super-2 number, since 2×10500661255505² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10500661255507) 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, 1050066125546 + ... + 1050066125555.

It is an arithmetic number, because the mean of its divisors is an integer number (3150198376653).

Almost surely, 2^{10500661255505} is an apocalyptic number.

It is an amenable number.

10500661255505 is a deficient number, since it is larger than the sum of its proper divisors (2100132251107).

10500661255505 is an equidigital number, since it uses as much as digits as its factorization.

10500661255505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2100132251106.

The product of its (nonzero) digits is 225000, while the sum is 41.

The spelling of 10500661255505 in words is "ten trillion, five hundred billion, six hundred sixty-one million, two hundred fifty-five thousand, five hundred five".