11605321651 has 32 divisors (see below), whose sum is σ = 14795712000. Its totient is φ = 9023847840.

The previous prime is 11605321633. The next prime is 11605321667. The reversal of 11605321651 is 15612350611.

It is a happy number.

It is not a de Polignac number, because 11605321651 - 2⁹ = 11605321139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11605421651) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1917436 + ... + 1923478.

It is an arithmetic number, because the mean of its divisors is an integer number (462366000).

Almost surely, 2^11605321651 is an apocalyptic number.

11605321651 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11605321651 is a deficient number, since it is larger than the sum of its proper divisors (3190390349).

11605321651 is an equidigital number, since it uses as much as digits as its factorization.

11605321651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6584 (or 6570 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 31.

The spelling of 11605321651 in words is "eleven billion, six hundred five million, three hundred twenty-one thousand, six hundred fifty-one".