665428061310 has 64 divisors (see below), whose sum is σ = 1615476234240. Its totient is φ = 175398854400.

The previous prime is 665428061197. The next prime is 665428061359. The reversal of 665428061310 is 13160824566.

It is a super-2 number, since 2×665428061310² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

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, 8888535 + ... + 8963085.

It is an arithmetic number, because the mean of its divisors is an integer number (25241816160).

Almost surely, 2^665428061310 is an apocalyptic number.

665428061310 is an abundant number, since it is smaller than the sum of its proper divisors (950048172930).

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

665428061310 is a wasteful number, since it uses less digits than its factorization.

665428061310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77993.

The product of its (nonzero) digits is 207360, while the sum is 42.

Adding to 665428061310 its reverse (13160824566), we get a palindrome (678588885876).

The spelling of 665428061310 in words is "six hundred sixty-five billion, four hundred twenty-eight million, sixty-one thousand, three hundred ten".