11666237838 has 16 divisors (see below), whose sum is σ = 23396056320. Its totient is φ = 3878149176.

The previous prime is 11666237837. The next prime is 11666237887. The reversal of 11666237838 is 83873266611.

It is a super-2 number, since 2×11666237838² (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 (11666237837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2646808 + ... + 2651211.

It is an arithmetic number, because the mean of its divisors is an integer number (1462253520).

Almost surely, 2^11666237838 is an apocalyptic number.

11666237838 is an abundant number, since it is smaller than the sum of its proper divisors (11729818482).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11666237838 is a wasteful number, since it uses less digits than its factorization.

11666237838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5298391.

The product of its digits is 1741824, while the sum is 51.

The spelling of 11666237838 in words is "eleven billion, six hundred sixty-six million, two hundred thirty-seven thousand, eight hundred thirty-eight".