66814134808 has 32 divisors (see below), whose sum is σ = 134243872560. Its totient is φ = 31063121920.

The previous prime is 66814134797. The next prime is 66814134823. The reversal of 66814134808 is 80843141866.

It is a super-2 number, since 2×66814134808² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2948233 + ... + 2970808.

Almost surely, 2^66814134808 is an apocalyptic number.

66814134808 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

66814134808 is an abundant number, since it is smaller than the sum of its proper divisors (67429737752).

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

66814134808 is a wasteful number, since it uses less digits than its factorization.

66814134808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5919147 (or 5919143 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 49.

The spelling of 66814134808 in words is "sixty-six billion, eight hundred fourteen million, one hundred thirty-four thousand, eight hundred eight".