65649802320 has 80 divisors (see below), whose sum is σ = 226127104320. Its totient is φ = 17506613376.

The previous prime is 65649802291. The next prime is 65649802333. The reversal of 65649802320 is 2320894656.

65649802320 is a `hidden beast` number, since 6 + 564 + 9 + 80 + 2 + 3 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 15194554 + ... + 15198873.

It is an arithmetic number, because the mean of its divisors is an integer number (2826588804).

Almost surely, 2^65649802320 is an apocalyptic number.

65649802320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65649802320 is an abundant number, since it is smaller than the sum of its proper divisors (160477302000).

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

65649802320 is a wasteful number, since it uses less digits than its factorization.

65649802320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30393449 (or 30393437 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 65649802320 in words is "sixty-five billion, six hundred forty-nine million, eight hundred two thousand, three hundred twenty".