65205261660 has 144 divisors (see below), whose sum is σ = 229350256128. Its totient is φ = 13549134720.

The previous prime is 65205261631. The next prime is 65205261673. The reversal of 65205261660 is 6616250256.

It is a happy number.

It is a super-2 number, since 2×65205261660² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 590712 + ... + 692351.

It is an arithmetic number, because the mean of its divisors is an integer number (1592710112).

Almost surely, 2^65205261660 is an apocalyptic number.

65205261660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65205261660 is an abundant number, since it is smaller than the sum of its proper divisors (164144994468).

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

65205261660 is a wasteful number, since it uses less digits than its factorization.

65205261660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1283104 (or 1283091 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The spelling of 65205261660 in words is "sixty-five billion, two hundred five million, two hundred sixty-one thousand, six hundred sixty".