65440321953 has 8 divisors (see below), whose sum is σ = 87300206400. Its totient is φ = 43603659408.

The previous prime is 65440321939. The next prime is 65440321963. The reversal of 65440321953 is 35912304456.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 65440321953 - 2⁶ = 65440321889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65440321963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5798898 + ... + 5810171.

It is an arithmetic number, because the mean of its divisors is an integer number (10912525800).

Almost surely, 2^65440321953 is an apocalyptic number.

It is an amenable number.

65440321953 is a deficient number, since it is larger than the sum of its proper divisors (21859884447).

65440321953 is a wasteful number, since it uses less digits than its factorization.

65440321953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11610951.

The product of its (nonzero) digits is 388800, while the sum is 42.

The spelling of 65440321953 in words is "sixty-five billion, four hundred forty million, three hundred twenty-one thousand, nine hundred fifty-three".