65505564 has 48 divisors (see below), whose sum is σ = 177219840. Its totient is φ = 20885040.

The previous prime is 65505553. The next prime is 65505571. The reversal of 65505564 is 46550556.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10702 + ... + 15669.

It is an arithmetic number, because the mean of its divisors is an integer number (3692080).

Almost surely, 2^65505564 is an apocalyptic number.

It is an amenable number.

65505564 is an abundant number, since it is smaller than the sum of its proper divisors (111714276).

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

65505564 is a wasteful number, since it uses less digits than its factorization.

65505564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26407 (or 26399 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

The square root of 65505564 is about 8093.5507658876. The cubic root of 65505564 is about 403.1123126348.

The spelling of 65505564 in words is "sixty-five million, five hundred five thousand, five hundred sixty-four".