66401310 has 64 divisors (see below), whose sum is σ = 165123072. Its totient is φ = 17076096.

The previous prime is 66401267. The next prime is 66401323. The reversal of 66401310 is 1310466.

It is a super-2 number, since 2×66401310² = 8818267939432200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 180747 + ... + 181113.

It is an arithmetic number, because the mean of its divisors is an integer number (2580048).

Almost surely, 2^66401310 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66401310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82561536).

66401310 is an abundant number, since it is smaller than the sum of its proper divisors (98721762).

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

66401310 is a wasteful number, since it uses less digits than its factorization.

66401310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 66401310 is about 8148.6998963025. The cubic root of 66401310 is about 404.9414333845.

Adding to 66401310 its reverse (1310466), we get a palindrome (67711776).

The spelling of 66401310 in words is "sixty-six million, four hundred one thousand, three hundred ten".