11666231215 has 16 divisors (see below), whose sum is σ = 15334116480. Its totient is φ = 8481088000.

The previous prime is 11666231201. The next prime is 11666231233. The reversal of 11666231215 is 51213266611.

It is not a de Polignac number, because 11666231215 - 2⁵ = 11666231183 is a prime.

It is a super-2 number, since 2×11666231215² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2363911 + ... + 2368840.

It is an arithmetic number, because the mean of its divisors is an integer number (958382280).

Almost surely, 2^11666231215 is an apocalyptic number.

11666231215 is a deficient number, since it is larger than the sum of its proper divisors (3667885265).

11666231215 is a wasteful number, since it uses less digits than its factorization.

11666231215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4732802.

The product of its digits is 12960, while the sum is 34.

Adding to 11666231215 its reverse (51213266611), we get a palindrome (62879497826).

The spelling of 11666231215 in words is "eleven billion, six hundred sixty-six million, two hundred thirty-one thousand, two hundred fifteen".