65551660 has 24 divisors (see below), whose sum is σ = 145756800. Its totient is φ = 24678144.

The previous prime is 65551621. The next prime is 65551693. The reversal of 65551660 is 6615556.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96060 + ... + 96739.

It is an arithmetic number, because the mean of its divisors is an integer number (6073200).

Almost surely, 2^65551660 is an apocalyptic number.

It is an amenable number.

65551660 is an abundant number, since it is smaller than the sum of its proper divisors (80205140).

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

65551660 is a wasteful number, since it uses less digits than its factorization.

65551660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192825 (or 192823 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 65551660 is about 8096.3979645272. The cubic root of 65551660 is about 403.2068466309.

The spelling of 65551660 in words is "sixty-five million, five hundred fifty-one thousand, six hundred sixty".