66401008 has 20 divisors (see below), whose sum is σ = 132803008. Its totient is φ = 32129280.

The previous prime is 66401003. The next prime is 66401009. The reversal of 66401008 is 80010466.

66401008 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66401003) 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, 66441 + ... + 67432.

Almost surely, 2^66401008 is an apocalyptic number.

It is an amenable number.

66401008 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66401008 is a wasteful number, since it uses less digits than its factorization.

66401008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133912 (or 133906 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 66401008 is about 8148.6813657180. The cubic root of 66401008 is about 404.9408194785.

The spelling of 66401008 in words is "sixty-six million, four hundred one thousand, eight".