666796810 has 16 divisors (see below), whose sum is σ = 1208997576. Its totient is φ = 264771328.

The previous prime is 666796783. The next prime is 666796813. The reversal of 666796810 is 18697666.

666796810 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 416935561 + 249861249 = 20419^2 + 15807^2 .

It is a super-2 number, since 2×666796810² = 889235971652352200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (666796813) 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, 241987 + ... + 244726.

Almost surely, 2^666796810 is an apocalyptic number.

666796810 is a deficient number, since it is larger than the sum of its proper divisors (542200766).

666796810 is a wasteful number, since it uses less digits than its factorization.

666796810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486857.

The product of its (nonzero) digits is 653184, while the sum is 49.

The square root of 666796810 is about 25822.4090665453. The cubic root of 666796810 is about 873.6373063745.

The spelling of 666796810 in words is "six hundred sixty-six million, seven hundred ninety-six thousand, eight hundred ten".