11667211511 has 4 divisors (see below), whose sum is σ = 11710264224. Its totient is φ = 11624158800.

The previous prime is 11667211499. The next prime is 11667211513. The reversal of 11667211511 is 11511276611.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11667211511 - 2¹⁸ = 11666949367 is a prime.

It is a super-2 number, since 2×11667211511² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11667211513) 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, 21525950 + ... + 21526491.

It is an arithmetic number, because the mean of its divisors is an integer number (2927566056).

Almost surely, 2^11667211511 is an apocalyptic number.

11667211511 is a deficient number, since it is larger than the sum of its proper divisors (43052713).

11667211511 is an equidigital number, since it uses as much as digits as its factorization.

11667211511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43052712.

The product of its digits is 2520, while the sum is 32.

The spelling of 11667211511 in words is "eleven billion, six hundred sixty-seven million, two hundred eleven thousand, five hundred eleven".