66780794 has 32 divisors (see below), whose sum is σ = 111099600. Its totient is φ = 29962240.

The previous prime is 66780793. The next prime is 66780803. The reversal of 66780794 is 49708766.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 10725625 + 56055169 = 3275^2 + 7487^2 .

It is not an unprimeable number, because it can be changed into a prime (66780793) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87374 + ... + 88134.

Almost surely, 2^66780794 is an apocalyptic number.

66780794 is a deficient number, since it is larger than the sum of its proper divisors (44318806).

66780794 is a wasteful number, since it uses less digits than its factorization.

66780794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898.

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 66780794 is about 8171.9516640763. The cubic root of 66780794 is about 405.7113829602.

The spelling of 66780794 in words is "sixty-six million, seven hundred eighty thousand, seven hundred ninety-four".