65401660 has 12 divisors (see below), whose sum is σ = 137343528. Its totient is φ = 26160656.

The previous prime is 65401657. The next prime is 65401697. The reversal of 65401660 is 6610456.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1635022 + ... + 1635061.

It is an arithmetic number, because the mean of its divisors is an integer number (11445294).

Almost surely, 2^65401660 is an apocalyptic number.

It is an amenable number.

65401660 is an abundant number, since it is smaller than the sum of its proper divisors (71941868).

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

65401660 is a wasteful number, since it uses less digits than its factorization.

65401660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3270092 (or 3270090 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 65401660 is about 8087.1292805296. The cubic root of 65401660 is about 402.8990628257.

The spelling of 65401660 in words is "sixty-five million, four hundred one thousand, six hundred sixty".