11662565261 has 8 divisors (see below), whose sum is σ = 11718680064. Its totient is φ = 11606562000.

The previous prime is 11662565227. The next prime is 11662565287. The reversal of 11662565261 is 16256526611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11662565261 - 2³⁰ = 10588823437 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11662564261) 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 7 ways as a sum of consecutive naturals, for example, 185636 + ... + 240386.

It is an arithmetic number, because the mean of its divisors is an integer number (1464835008).

Almost surely, 2^11662565261 is an apocalyptic number.

It is an amenable number.

11662565261 is a deficient number, since it is larger than the sum of its proper divisors (56114803).

11662565261 is an equidigital number, since it uses as much as digits as its factorization.

11662565261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55771.

The product of its digits is 129600, while the sum is 41.

The spelling of 11662565261 in words is "eleven billion, six hundred sixty-two million, five hundred sixty-five thousand, two hundred sixty-one".