11661662165 has 8 divisors (see below), whose sum is σ = 13995735768. Its totient is φ = 9328168960.

The previous prime is 11661662141. The next prime is 11661662189. The reversal of 11661662165 is 56126616611.

It is an interprime number because it is at equal distance from previous prime (11661662141) and next prime (11661662189).

It can be written as a sum of positive squares in 4 ways, for example, as 3056873521 + 8604788644 = 55289^2 + 92762^2 .

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

It is not a de Polignac number, because 11661662165 - 2²⁶ = 11594553301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99596 + ... + 182325.

It is an arithmetic number, because the mean of its divisors is an integer number (1749466971).

Almost surely, 2^11661662165 is an apocalyptic number.

It is an amenable number.

11661662165 is a deficient number, since it is larger than the sum of its proper divisors (2334073603).

11661662165 is an equidigital number, since it uses as much as digits as its factorization.

11661662165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290199.

The product of its digits is 77760, while the sum is 41.

The spelling of 11661662165 in words is "eleven billion, six hundred sixty-one million, six hundred sixty-two thousand, one hundred sixty-five".