66790660 has 24 divisors (see below), whose sum is σ = 140789376. Its totient is φ = 26615520.

The previous prime is 66790657. The next prime is 66790663. The reversal of 66790660 is 6609766.

66790660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (66790657) and next prime (66790663).

It is not an unprimeable number, because it can be changed into a prime (66790663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 742 + ... + 11581.

It is an arithmetic number, because the mean of its divisors is an integer number (5866224).

Almost surely, 2^66790660 is an apocalyptic number.

It is an amenable number.

66790660 is an abundant number, since it is smaller than the sum of its proper divisors (73998716).

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

66790660 is a wasteful number, since it uses less digits than its factorization.

66790660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12603 (or 12601 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 66790660 is about 8172.5552919512. Note that the first 3 decimals coincide. The cubic root of 66790660 is about 405.7313615157.

The spelling of 66790660 in words is "sixty-six million, seven hundred ninety thousand, six hundred sixty".