666166010 has 16 divisors (see below), whose sum is σ = 1221724296. Its totient is φ = 261438528.

The previous prime is 666165971. The next prime is 666166013. The reversal of 666166010 is 10661666.

It can be written as a sum of positive squares in 4 ways, for example, as 519247369 + 146918641 = 22787^2 + 12121^2 .

It is not an unprimeable number, because it can be changed into a prime (666166013) 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, 627929 + ... + 628988.

Almost surely, 2^666166010 is an apocalyptic number.

666166010 is a deficient number, since it is larger than the sum of its proper divisors (555558286).

666166010 is a wasteful number, since it uses less digits than its factorization.

666166010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256977.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 666166010 is about 25810.1919791388. The cubic root of 666166010 is about 873.3617280294.

The spelling of 666166010 in words is "six hundred sixty-six million, one hundred sixty-six thousand, ten".