66400568 has 16 divisors (see below), whose sum is σ = 134078280. Its totient is φ = 30646368.

The previous prime is 66400567. The next prime is 66400571. The reversal of 66400568 is 86500466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66400567) 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, 319130 + ... + 319337.

Almost surely, 2^66400568 is an apocalyptic number.

It is an amenable number.

66400568 is an abundant number, since it is smaller than the sum of its proper divisors (67677712).

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

66400568 is a wasteful number, since it uses less digits than its factorization.

66400568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638486 (or 638482 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 66400568 is about 8148.6543674401. The cubic root of 66400568 is about 404.9399250425.

The spelling of 66400568 in words is "sixty-six million, four hundred thousand, five hundred sixty-eight".