66400011 has 24 divisors (see below), whose sum is σ = 105973920. Its totient is φ = 39849216.

The previous prime is 66399967. The next prime is 66400013. The reversal of 66400011 is 11000466.

66400011 is a `hidden beast` number, since 664 + 0 + 0 + 0 + 1 + 1 = 666.

It is not a de Polignac number, because 66400011 - 2¹¹ = 66397963 is a prime.

It is a super-2 number, since 2×66400011² = 8817922921600242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66400013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5916 + ... + 12953.

It is an arithmetic number, because the mean of its divisors is an integer number (4415580).

Almost surely, 2^66400011 is an apocalyptic number.

66400011 is a deficient number, since it is larger than the sum of its proper divisors (39573909).

66400011 is a wasteful number, since it uses less digits than its factorization.

66400011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18915 (or 18912 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 66400011 is about 8148.6201899463. The cubic root of 66400011 is about 404.9387927622.

Adding to 66400011 its reverse (11000466), we get a palindrome (77400477).

The spelling of 66400011 in words is "sixty-six million, four hundred thousand, eleven".