11660651551 has 4 divisors (see below), whose sum is σ = 11666372400. Its totient is φ = 11654930704.

The previous prime is 11660651537. The next prime is 11660651567. The reversal of 11660651551 is 15515606611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15515606611 = 137 ⋅113252603.

It is a cyclic number.

It is not a de Polignac number, because 11660651551 - 2¹³ = 11660643359 is a prime.

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 11660651551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11660651521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2857366 + ... + 2861443.

It is an arithmetic number, because the mean of its divisors is an integer number (2916593100).

Almost surely, 2^11660651551 is an apocalyptic number.

11660651551 is a deficient number, since it is larger than the sum of its proper divisors (5720849).

11660651551 is an equidigital number, since it uses as much as digits as its factorization.

11660651551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5720848.

The product of its (nonzero) digits is 27000, while the sum is 37.

The spelling of 11660651551 in words is "eleven billion, six hundred sixty million, six hundred fifty-one thousand, five hundred fifty-one".