11966172101 has 4 divisors (see below), whose sum is σ = 12886646892. Its totient is φ = 11045697312.

The previous prime is 11966172083. The next prime is 11966172121. The reversal of 11966172101 is 10127166911.

It is a Cunningham number, because it is equal to 109390²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10127166911 = 41 ⋅247004071.

It can be written as a sum of positive squares in 2 ways, for example, as 1770221476 + 10195950625 = 42074^2 + 100975^2 .

It is a de Polignac number, because none of the positive numbers 2^k-11966172101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11966172121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 460237376 + ... + 460237401.

It is an arithmetic number, because the mean of its divisors is an integer number (3221661723).

Almost surely, 2^11966172101 is an apocalyptic number.

It is an amenable number.

11966172101 is a deficient number, since it is larger than the sum of its proper divisors (920474791).

11966172101 is an equidigital number, since it uses as much as digits as its factorization.

11966172101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920474790.

The product of its (nonzero) digits is 4536, while the sum is 35.

The spelling of 11966172101 in words is "eleven billion, nine hundred sixty-six million, one hundred seventy-two thousand, one hundred one".