11506466665 has 4 divisors (see below), whose sum is σ = 13807760004. Its totient is φ = 9205173328.

The previous prime is 11506466639. The next prime is 11506466701. The reversal of 11506466665 is 56666460511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56666460511 = 163 ⋅347646997.

It can be written as a sum of positive squares in 2 ways, for example, as 7931861721 + 3574604944 = 89061^2 + 59788^2 .

It is a cyclic number.

It is not a de Polignac number, because 11506466665 - 2²⁹ = 10969595753 is a prime.

It is a super-2 number, since 2×11506466665² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1150646662 + ... + 1150646671.

It is an arithmetic number, because the mean of its divisors is an integer number (3451940001).

Almost surely, 2^11506466665 is an apocalyptic number.

It is an amenable number.

11506466665 is a deficient number, since it is larger than the sum of its proper divisors (2301293339).

11506466665 is an equidigital number, since it uses as much as digits as its factorization.

11506466665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2301293338.

The product of its (nonzero) digits is 777600, while the sum is 46.

The spelling of 11506466665 in words is "eleven billion, five hundred six million, four hundred sixty-six thousand, six hundred sixty-five".