11721248620605 has 24 divisors (see below), whose sum is σ = 20322701432280. Its totient is φ = 6249526293120.

The previous prime is 11721248620559. The next prime is 11721248620639. The reversal of 11721248620605 is 50602684212711.

11721248620605 is a `hidden beast` number, since 1 + 1 + 7 + 2 + 12 + 4 + 8 + 6 + 20 + 605 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 640299234969 + 11080949385636 = 800187^2 + 3328806^2 .

It is not a de Polignac number, because 11721248620605 - 2⁹ = 11721248620093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37473870 + ... + 37785359.

It is an arithmetic number, because the mean of its divisors is an integer number (846779226345).

Almost surely, 2^{11721248620605} is an apocalyptic number.

11721248620605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11721248620605 is a deficient number, since it is larger than the sum of its proper divisors (8601452811675).

11721248620605 is a wasteful number, since it uses less digits than its factorization.

11721248620605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75262701 (or 75262698 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The spelling of 11721248620605 in words is "eleven trillion, seven hundred twenty-one billion, two hundred forty-eight million, six hundred twenty thousand, six hundred five".