11671891207 has 4 divisors (see below), whose sum is σ = 11673060696. Its totient is φ = 11670721720.

The previous prime is 11671891199. The next prime is 11671891211. The reversal of 11671891207 is 70219817611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70219817611 = 61 ⋅1151144551.

It is a cyclic number.

It is not a de Polignac number, because 11671891207 - 2³ = 11671891199 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 (11671891307) 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, 569644 + ... + 589777.

It is an arithmetic number, because the mean of its divisors is an integer number (2918265174).

Almost surely, 2^11671891207 is an apocalyptic number.

11671891207 is a deficient number, since it is larger than the sum of its proper divisors (1169489).

11671891207 is a wasteful number, since it uses less digits than its factorization.

11671891207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169488.

The product of its (nonzero) digits is 42336, while the sum is 43.

The spelling of 11671891207 in words is "eleven billion, six hundred seventy-one million, eight hundred ninety-one thousand, two hundred seven".