66359820 has 24 divisors (see below), whose sum is σ = 185807664. Its totient is φ = 17695936.

The previous prime is 66359803. The next prime is 66359827. The reversal of 66359820 is 2895366.

It is not an unprimeable number, because it can be changed into a prime (66359827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 552939 + ... + 553058.

It is an arithmetic number, because the mean of its divisors is an integer number (7741986).

Almost surely, 2^66359820 is an apocalyptic number.

66359820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66359820 is an abundant number, since it is smaller than the sum of its proper divisors (119447844).

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

66359820 is a wasteful number, since it uses less digits than its factorization.

66359820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106009 (or 1106007 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 66359820 is about 8146.1536936152. The cubic root of 66359820 is about 404.8570750057.

The spelling of 66359820 in words is "sixty-six million, three hundred fifty-nine thousand, eight hundred twenty".