10091955646505 has 4 divisors (see below), whose sum is σ = 12110346775812. Its totient is φ = 8073564517200.

The previous prime is 10091955646489. The next prime is 10091955646519. The reversal of 10091955646505 is 50564655919001.

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 2089981988329 + 8001973658176 = 1445677^2 + 2828776^2 .

It is not a de Polignac number, because 10091955646505 - 2⁴ = 10091955646489 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1009195564646 + ... + 1009195564655.

It is an arithmetic number, because the mean of its divisors is an integer number (3027586693953).

Almost surely, 2^{10091955646505} is an apocalyptic number.

It is an amenable number.

10091955646505 is a deficient number, since it is larger than the sum of its proper divisors (2018391129307).

10091955646505 is an equidigital number, since it uses as much as digits as its factorization.

10091955646505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2018391129306.

The product of its (nonzero) digits is 7290000, while the sum is 56.

The spelling of 10091955646505 in words is "ten trillion, ninety-one billion, nine hundred fifty-five million, six hundred forty-six thousand, five hundred five".