65666606610 has 128 divisors (see below), whose sum is σ = 182734755840. Its totient is φ = 14934758400.

The previous prime is 65666606609. The next prime is 65666606611. The reversal of 65666606610 is 1660666656.

It is an interprime number because it is at equal distance from previous prime (65666606609) and next prime (65666606611).

It is a self number, because there is not a number n which added to its sum of digits gives 65666606610.

It is not an unprimeable number, because it can be changed into a prime (65666606611) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 594970 + ... + 696650.

It is an arithmetic number, because the mean of its divisors is an integer number (1427615280).

Almost surely, 2^65666606610 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65666606610, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91367377920).

65666606610 is an abundant number, since it is smaller than the sum of its proper divisors (117068149230).

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

65666606610 is a wasteful number, since it uses less digits than its factorization.

65666606610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101824.

The product of its (nonzero) digits is 1399680, while the sum is 48.

It can be divided in two parts, 65666 and 606610, that added together give a palindrome (672276).

The spelling of 65666606610 in words is "sixty-five billion, six hundred sixty-six million, six hundred six thousand, six hundred ten".