11651006566 has 4 divisors (see below), whose sum is σ = 17476509852. Its totient is φ = 5825503282.

The previous prime is 11651006561. The next prime is 11651006567. The reversal of 11651006566 is 66560015611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66560015611 = 1181 ⋅56359031.

It is a super-2 number, since 2×11651006566² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11651006561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2912751640 + ... + 2912751643.

It is an arithmetic number, because the mean of its divisors is an integer number (4369127463).

Almost surely, 2^11651006566 is an apocalyptic number.

11651006566 is a deficient number, since it is larger than the sum of its proper divisors (5825503286).

11651006566 is an equidigital number, since it uses as much as digits as its factorization.

11651006566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5825503285.

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 11651006566 in words is "eleven billion, six hundred fifty-one million, six thousand, five hundred sixty-six".