66388011 has 8 divisors (see below), whose sum is σ = 89048064. Its totient is φ = 43993320.

The previous prime is 66387977. The next prime is 66388013. The reversal of 66388011 is 11088366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66388011 - 2⁷ = 66387883 is a prime.

It is a super-2 number, since 2×66388011² = 8814736009072242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66388013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65755 + ... + 66756.

It is an arithmetic number, because the mean of its divisors is an integer number (11131008).

Almost surely, 2^66388011 is an apocalyptic number.

66388011 is a deficient number, since it is larger than the sum of its proper divisors (22660053).

66388011 is a wasteful number, since it uses less digits than its factorization.

66388011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132681.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 66388011 is about 8147.8838356962. The cubic root of 66388011 is about 404.9143973934.

The spelling of 66388011 in words is "sixty-six million, three hundred eighty-eight thousand, eleven".