66497790 has 32 divisors (see below), whose sum is σ = 164745216. Its totient is φ = 17160480.

The previous prime is 66497749. The next prime is 66497797. The reversal of 66497790 is 9779466.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66497797) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 34822 + ... + 36681.

It is an arithmetic number, because the mean of its divisors is an integer number (5148288).

Almost surely, 2^66497790 is an apocalyptic number.

66497790 is an abundant number, since it is smaller than the sum of its proper divisors (98247426).

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

66497790 is a wasteful number, since it uses less digits than its factorization.

66497790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71544.

The product of its (nonzero) digits is 571536, while the sum is 48.

The square root of 66497790 is about 8154.6177102302. The cubic root of 66497790 is about 405.1374628638.

The spelling of 66497790 in words is "sixty-six million, four hundred ninety-seven thousand, seven hundred ninety".