65440221552 has 60 divisors (see below), whose sum is σ = 191104424784. Its totient is φ = 20864997120.

The previous prime is 65440221541. The next prime is 65440221577. The reversal of 65440221552 is 25512204456.

65440221552 is a `hidden beast` number, since 65 + 4 + 40 + 2 + 2 + 1 + 552 = 666.

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

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9875949 + ... + 9882572.

Almost surely, 2^65440221552 is an apocalyptic number.

It is an amenable number.

65440221552 is an abundant number, since it is smaller than the sum of its proper divisors (125664203232).

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

65440221552 is a wasteful number, since it uses less digits than its factorization.

65440221552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19758558 (or 19758549 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 36.

The spelling of 65440221552 in words is "sixty-five billion, four hundred forty million, two hundred twenty-one thousand, five hundred fifty-two".