66051808 has 24 divisors (see below), whose sum is σ = 133556472. Its totient is φ = 32132736.

The previous prime is 66051803. The next prime is 66051823. The reversal of 66051808 is 80815066.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66051803) 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, 26710 + ... + 29077.

It is an arithmetic number, because the mean of its divisors is an integer number (5564853).

Almost surely, 2^66051808 is an apocalyptic number.

It is an amenable number.

66051808 is an abundant number, since it is smaller than the sum of its proper divisors (67504664).

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

66051808 is a wasteful number, since it uses less digits than its factorization.

66051808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55834 (or 55826 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 66051808 is about 8127.2263411326. The cubic root of 66051808 is about 404.2297161047.

The spelling of 66051808 in words is "sixty-six million, fifty-one thousand, eight hundred eight".