665556610 has 8 divisors (see below), whose sum is σ = 1198001916. Its totient is φ = 266222640.

The previous prime is 665556601. The next prime is 665556637. The reversal of 665556610 is 16655566.

665556610 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 2 ways, for example, as 612018121 + 53538489 = 24739^2 + 7317^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×665556610² = 885931202229384200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33277821 + ... + 33277840.

Almost surely, 2^665556610 is an apocalyptic number.

665556610 is a deficient number, since it is larger than the sum of its proper divisors (532445306).

665556610 is a wasteful number, since it uses less digits than its factorization.

665556610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66555668.

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 665556610 is about 25798.3838641106. The cubic root of 665556610 is about 873.0953334656.

The spelling of 665556610 in words is "six hundred sixty-five million, five hundred fifty-six thousand, six hundred ten".