66803766 has 8 divisors (see below), whose sum is σ = 133607544. Its totient is φ = 22267920.

The previous prime is 66803747. The next prime is 66803767. The reversal of 66803766 is 66730866.

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

66803766 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66803767) 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, 5566975 + ... + 5566986.

It is an arithmetic number, because the mean of its divisors is an integer number (16700943).

Almost surely, 2^66803766 is an apocalyptic number.

66803766 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.

66803766 is a wasteful number, since it uses less digits than its factorization.

66803766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11133966.

The product of its (nonzero) digits is 217728, while the sum is 42.

The square root of 66803766 is about 8173.3570826191. The cubic root of 66803766 is about 405.7578979978.

Subtracting from 66803766 its reverse (66730866), we obtain a square (72900 = 270²).

The spelling of 66803766 in words is "sixty-six million, eight hundred three thousand, seven hundred sixty-six".